2/24/2017 new driver models for direct download:521
A4tech Op-50d 5 stars review"The best driver WIKI ever! I wil keep coming back for sure."Eric Smalter, Boston, MA
Supported languages for A4tech Op-50d
Certifications for A4tech Op-50d
5 stars for A4tech Op-50d "WOW! Finally my PC got up to speed!" Melany Kim 7/18/2015

Checking...for 2/24/2017 Updates

All drivers on are updated on daily basis.

However, a new version of A4tech Op-50d might have been uploaded since our last site update.

A4tech Op-50d Driver Download

Windows Compatibility for A4tech Op-50d driver

A4tech Op-50d Driver Details:

A4tech Op-50d File Name:

A4tech Op-50d Driver Version: 999f6o

A4tech Op-50d ZIP Size: 100.kb

Manufacturer: A4tech

A4tech Op-50d was fully scanned at: 2/21/2017
Scan Status: driver download scanOK

A4tech Op-50d special revision for: Windows Vista Business 64 bit, Windows XP Professional x64 Edition 32 bit, Windows 7 Enterprise (Microsoft Windows NT) 64 bit, Windows 7 Service Pack 1 (Microsoft Windows NT) 64 bit, Windows XP Home Edition, for home desktops and laptops 64 bit, Windows XP Media Center Edition 2004 32 bit

A4tech Op-50d Download Stats:

Driver Uploaded: 12/8/2016

Direct Downloads: 214
Most Recent Download: 2/22/2017
Managed Downloads: 6613
Most Recent Download: 2/22/2017
Download Mirrors: 4
Current Delay: 8 Seconds
Driver License: GNU

Direct Download Success Stats:

Reports Issued By 163/214 Users

Success Reported By 37/163 Users

Driver Download Score70/100

Driver Installation Score69/100

Overall preformance Score60/100

A4tech Op-50d 14 Thumbs Up14Thumbs
A4tech Op-50d 2 Thumbs Down2Thumbs
A4tech Op-50d driver direct download was reported as adequate by a large percentage of our reporters, so it should be good to download and install.

Installation Manager Success Stats:

Reports Issued By 5492/6613 Users

Success Reported By 4377/5492 Users

Driver Download Score87/100

Driver Installation Score84/100

Overall preformance Score92/100

A4tech Op-50d 4035 Thumbs Up4035Thumbs
A4tech Op-50d 49 Thumbs Down49Thumbs
A4tech Op-50d driver installation manager was reported as very satisfying by a large percentage of our reporters, so it is recommended to download and install.


1. Direct Download

Select your OS and press "Download".

This option requires basic OS understanding.
Select Your Operating System, download zipped files, and then proceed to
manually install them.
Recommended if A4tech Op-50d is the only driver on your PC you wish to update.


2. Driver Installation Manager

This option requires no OS understanding.
Automatically scans your PC for the specific required version of A4tech Op-50d + all other outdated drivers, and installs them all at once.

Please help us maintain a helpfull driver collection.
After downloading and installing A4tech Op-50d, or the driver installation manager, take a few minutes to send us a report:
* Only registered users can upload a report.

Don’t have a password?
Please register, and get one.

A4tech Op-50d may sometimes be at fault for other drivers ceasing to function

These are the driver scans of 2 of our recent wiki members*

*Scans were performed on computers suffering from A4tech Op-50d disfunctions.

Scan performed on 2/24/2017, Computer: SAMSUN NC10

Outdated or Corrupted drivers:9/21

Device/DriverStatusStatus DescriptionUpdated By Scanner
Intel(R) Xeon(R) E5 v2/Core i7 Power Control Unit 0 - 0EC0Up To Date and Functioning
Mice And Touchpads
SMART HID-compliant mouseCorrupted By A4tech Op-50d
Microsoft MICROSOFT SERIAL MOUSE 2.1AUp To Date and Functioning
Razer USA HID mouseCorrupted By A4tech Op-50d
Usb Devices
Intel(R) ICH9-Familie USB universeller Hostcontroller - 2934Corrupted By A4tech Op-50d
Initio Dispositif de stockage de masse USBUp To Date and Functioning Burr-Brown USB Audio Codec 2900 (commercial 2.8.45)Up To Date and Functioning
Sound Cards And Media Devices
Advanced Micro Devices AMD Radeon HD 6800 SeriesCorrupted By A4tech Op-50d
AVerMedia Controller video multimedialeUp To Date and Functioning
Network Cards
Intel(R) Centrino(R) Advanced-N 6235Up To Date and Functioning
Microsoft Keyboard Device FilterUp To Date and Functioning
Hard Disk Controller
Microsoft Intel(R) 82801DBM Ultra ATA Storage Controller - 24CAOutdated
Nokia Nokia C6-00 USB LCIFCorrupted By A4tech Op-50d
Point Grey Research Texas Instruments 1394 OHCI Compliant Host ControllerUp To Date and Functioning
Texas Instruments Texas Instruments PCI-4520 CardBus ControllerUp To Date and Functioning
Cameras, Webcams And Scanners
USB2.0 PC CAMERA Periferica video USBUp To Date and Functioning
Video Cards
Intel(R) HD Graphics 4000Corrupted By A4tech Op-50d
Input Devices
Logitech Logitech WingMan Digital DeviceUp To Date and Functioning
Port Devices
MediaTek MediaTek PreLoader USB VCOM Port (COM51)Corrupted By A4tech Op-50d
Sony Digital Flat Panel (1024x768)Outdated
Mobile Phones And Portable Devices
Acer NOKIAUp To Date and Functioning

Scan performed on 2/24/2017, Computer: IBM 2373WZW

Outdated or Corrupted drivers:8/20

Device/DriverStatusStatus DescriptionUpdated By Scanner
Intel(R) 4th Gen Core processor DRAM Controller - 0C00Up To Date and Functioning
Mice And Touchpads
A4Tech HID mouseUp To Date and Functioning
Usb Devices
Microsoft Intel(r) 82801BA/BAM USB Universal Host Controller - 2442Outdated
Sound Cards And Media Devices
Microsoft Microsoft LifeCam VX-2000.Up To Date and Functioning
Lifeview FlyDVB-T Hybrid miniUp To Date and Functioning
Network Cards
Broadcom Broadcom BCM943228HMB 802.11abgn 2x2 Wi-Fi AdapterUp To Date and Functioning
Microsoft HID KeyboardCorrupted By A4tech Op-50d
Hard Disk Controller
SiS SiS PCI IDE-controllerUp To Date and Functioning
Texas Instruments Texas Instruments PCI-4510 CardBus ControllerCorrupted By A4tech Op-50d
Microsoft Texas Instruments PCI-1520 CardBus ControllerUp To Date and Functioning
Broadcom Broadcom Bluetooth 4.0Corrupted By A4tech Op-50d
NEC Generic CardBus-kontrollerCorrupted By A4tech Op-50d
Nokia Nokia C6-00 USB OBEXCorrupted By A4tech Op-50d
Broadcom ThinkPad Bluetooth 4.0Up To Date and Functioning
Cameras, Webcams And Scanners
Canon Canon MP160Up To Date and Functioning
Video Cards
NVIDIA NVIDIA GeForce GT 630MUp To Date and Functioning
Input Devices
KME USB-brugerstyret inputenhed (HID)Corrupted By A4tech Op-50d
Port Devices
ONDA ONDA USB Enumerator For AT DeviceUp To Date and Functioning
Sony Digital Flat Panel (1024x768)Corrupted By A4tech Op-50d
Mobile Phones And Portable Devices
Acer NOKIAUp To Date and Functioning
Driver ModelOriginal Upload DateLast ModificationDriver FileFile SizeCompatible Computer ModelsAvailabilty To Instalation Manager
A4tech Op-50d 601.1689/26/201412/30/2016a4tech_op-50d-601.168.exe125kbNEC PC-LL700ED, WIPRO WIV37455-1080, Panasonic CF-SX2JE4DS, LG E500-S.AP28P, MSI MS-9899, HP HP Compaq dc7600 Base Convertible Minito, Acer Aspire 5940G, Gateway FX6800, NEC PC-MY24RAZ75, Panasonic CF-19FLJC7AA, Toshiba SATELLITE C855-20M, HP XXX, and more.
A4tech Op-50d 1.13321/15/201512/28/2016a4tech_op-50d-1.1332.exe59kbAcer Aspire 5940G, Supermicro X9DRW-7/iTPF, AMD & ATI P030A, HP 520-1000pt, Toshiba SATELLITE C850-16W, Acer Aspire5740, Lenovo 10AH0016US, DIXONSXP Philips Freevents, Sony VGN-A39GP, IBM 2374WDG, ASUS BP6260, LG G1-223YA2, Lenovo ThinkPad T430u, Sony VGN-CS26G_R, HP HP Pavilion dv6-6128ca, and more.
A4tech Op-50d 6091.173/4/201512/29/2016a4tech_op-50d-6091.17.exe20kbHP NC232AA-UUZ IQ820ch, HP FK479AAR-ABA s3600t, HP P6786l, Powerspec B647, HP HP Compaq nw8440, ABook Z410, LG R470-KR30K, Compaq DC477A-ABA S3100NX NA111, NEC PC-VG32SZZEJ, Toshiba SATELLITE L850-A903, and more.
A4tech Op-50d Q4328410/22/201412/27/2016-q43284.exe170kbHP KY731AA-AKL a6784l, Velocity Micro CINEMAGIX, AT ALSEN, LG R1-GLMMA3, Toshiba SATELLITE C850-A791, Lenovo ThinkServer TS430, NEC PC-VW770FS6B, Lenovo 20AY001DMD, Samsung SM50S, , HP VS243AA-ABD HPE-010de, BenQ Joybook S32, Sony VPCCB46EC, Packard Bell EasyNote TM01, IBM 808735M, and more.
A4tech Op-50d 41.122412/5/201412/29/2016a4tech_op-50d-41.1224.exe33kbSony VPCEH40EBW, HP HP Pavilion dv5, IBM 23728EG, NEC PC-LL700GD, NEC PC-MY30XEZE3, Dell Latitude 7350, Sony VGN-NW24MG, ASUS L8400F series Notebook PC, IBM 8190LGJ, HP 500-129, NEC PC-VN770JS3EB, and more.
A4tech Op-50d T721.1369/17/201412/30/2016a4tech_op-50d-t721.136.exe202kbSamsung R510/P510, Packard Bell Ixtreme M5741, Sony VGN-TT250N, Samsung 305E4A/305E5A/305E7A, WIPRO WSG37455V-0008, Gateway E-155CG, Biostar TA960, IBM 8184MMY, Acer Veriton L670, Sony VGN-SZ77N_C, IBM 4838137, Medion S2211, Sony VPCM126AA, Mitsubishi AL12FBHEZ42W, Lenovo ThinkPad Edge E520, Sony VGN-SR430J, GETAC V100-X, and more.
A4tech Op-50d 1.140289/1/201412/28/2016a4tech_op-50d-1.14028.exe188kbHP G5310be-m, Toshiba SATELLITE S50D-A-10H, Acer Veriton S680G, Panasonic CF-52RE301QW, HP GU508AA-B14, Toshiba Dynabook SS LX/190DR, HP FQ553AA-ABA a6608f, HP HP 620, IBM 26478RG, Sun Microsystems K85AE, Compal DL7x, Compaq GS367AA-AB4 SR5175CF, IBM 2672CBE, Sony VGN-NS305D, Fujitsu CELSIUS W380, Sony VGN-AR51J, HP VT557AA-ABG 600-1150a, and more.
A4tech Op-50d P6-2453es, Sony VPCEB19GX, NEC Express5800/56Xe [N8000-672, LG B50PS.AR5MB3E, Intel C16, Dell PowerEdge R410, NOVATECH BB-83208A, Fujitsu LifeBook N6470, IBM NetVista personal computer, Positivo POS-ECIG31BT, Clevo P15xEMx, Packard Bell ISTART 9112, NEC VERSAP550 NN680209359, Packard Bell ISTART C5410 AIO, HP VC906AA-ABF IQ842f, Toshiba SATELLITE C855-1QG, Gigabyte S11M, AT TRILINE PROFI I102, Sony PCG-FR295MP, and more.
A4tech Op-50d 2.132.1689/19/201412/30/2016a4tech_op-50d-2.132.168.exe107kbHP HP dc5000 SFF, HP WX217AV-ABA MS230z, Acer Aspire 1601M, Sony SVE14123CBP, Sony VGN-SZ38GP_C, Lenovo ThinkCentre M57p, HP HP Compaq nc6220, Sony VGN-TT46MG_B, HP Pav dv6521 mariner, HP HPE-400es, Lenovo 7358W17, Sony VGN-CS60B_Q, Supermicro P4SAA, Sony VGC-RT150DY, Fujitsu FMVNF50WWJ, VIA VT8367-8233/5, HP GG625AA-UUW, and more.
A4tech Op-50d V2.1299210/8/201412/29/2016a4tech_op-50d-v2.12992.exe64kbSeneca V68357, NEC PC-VJ10MCHE2, Sony SVT1113AJE, Lenovo ThinkPad L430, HP CQ2800EEm, Toshiba SATELLITE C850-16W, Toshiba SATELLITE C870-162, Packard Bell IXTREME MC 9740, WIPRO WIV37555-1436, HP HP d530 CMT, HP DK320A-ABA A206X, Sony VPCL22AJ, Lenovo 3000 J200 Desktop, HP Compaq nx7010, Lenovo 6457WKW, LG K1-337AB1, HP 520-1000pt, Lenovo ThinkPad SL500, and more.
A4tech Op-50d B401.14212/10/201412/29/2016a4tech_op-50d-b401.142.exe198kbFujitsu FMVNT5FT4, Sony VGC-JS410F, Prosys P5P800, IBM 268452M, LG S1-M223A8, HP FL447AA-ACB a6641ru, HP ES133AA-UUZ, Lenovo ThinkPad Edge E430, Compaq NY682AA-AR6 CQ3132L, NEC EASYNOTE PB47S00286, Panasonic CF-W2EC1AXS, NEC PC-LL700BS6R, LG R490-KR8WK, ASUS N56VM, and more.
A4tech Op-50d BP6260, LG G1-223YA2, Lenovo ThinkPad T430u, Sony VGN-CS26G_R, HP HP Pavilion dv6-6128ca, HP HP Pavilion TS 10 Notebook PC, Epson AT970-KD2, Lanix LANIX CORP 4080, Sony VGN-FE52B_H, Seneca Pro38611, NEC PC-MY18ABZE4, Sony VGN-NW20EF_W, and more.
A4tech Op-50d Y440379/13/201412/29/2016a4tech_op-50d-y44037.exe150kbASUS G750JW, Lenovo 1049, HP PS378AA-ABN, Fujitsu FMVWMS157T, NEC PB12V00106, ECS 945GTY-M, Fujitsu FPC03080AL, HP HP Pavilion dv4 FT194EA#ABE, Lenovo 10AJ0002GE, Sony VGN-NS31ST_S, Gateway MT6220B, Lenovo 6458V35, NEC PC-GV296VZGL, Sony VGN-FW5ZRF_H, HP G5310be-m, Sony VOA, LG LW75-P333, and more.
A4tech Op-50d 8371.171/18/201512/29/2016a4tech_op-50d-8371.17.exe200kbSony VPCW126AG, HP P7-1090be, HP Hp elite hpe410f, Fujitsu FMVNXA90N, Gateway GT5418E, NEC RNM21223076, NEC EASYNOTE PB37R00002, Lenovo 6471EGR, Fujitsu FMVXDE6K2Z, Toshiba SATELLITE L850-A891, Lenovo ThinkPad X130e, Lenovo ThinkCentre M55e, Dell S5400SF, Acer AT310 F1, Packard Bell EasyNote_F0946-U-020, Gateway DX441X, Toshiba Dynabook EX/56LWH, Lenovo 3484 - DBG, and more.
A4tech Op-50d V2033012/21/201412/29/2016a4tech_op-50d-v20330.exe219kbSony VGN-FE41ZR, Dell Vostro 3446, Sony VPCF13QFX, NEC PC-MJ29MLZ2JCSG, Sony VPCCW23FD, IBM 8309K1G, Toshiba Dynabook T642/T8HB, HP P8652A-ABF 722, IBM ThinkPad X40, Lenovo ThinkPad T430u, and more.
A4tech Op-50d S3227312/6/201412/30/2016a4tech_op-50d-s32273.exe39kbNEC PC-MY26XRZJTSBJ, Sony VGN-CR21S_P, Panasonic CF-29NAQC9BM, Sony PCG-FR295MP, HP Presario V6000, T-Systems T-Systems PC P4PE, NEC PC-MY30VBZED, Packard Bell IMEDIA D5089 BE, Toshiba Dynabook Qosmio T750/T8BS, LG R405-A.CPF1E1, HP HP Pavilion dv8000, HP PN113AA-ABF t790.f, CASPER CASPER NEO, Sony VPCEB1E9R, HP HPE-350es, NEC PC-VW770FS6B, and more.
A4tech Op-50d 81.18642/15/201512/30/2016a4tech_op-50d-81.1864.exe148kbAvermedia 3150, HP HP G60 Notebook PC, IBYTE AS471100, Packard Bell IMEDIA 6556, IBM ThinkPad A30, Toshiba Qosmio F50, HP EC619AA-ABY, Packard Bell Ixtreme i7650, WIPRO WIV37455-0863, Fujitsu PRIMERGY RX200 S8, Lenovo ThinkPad SL410, Compal HGL30C, AT TRILINE PROFI I48, LG R590-XR7WK, NEC PC-MJ28VHZEJ, IBM ThinkCentre A51, and more.
A4tech Op-50d 2242010/3/201412/27/2016a4tech_op-50d-22420.exe175kbGateway MD7321U, NEC VERSAE6300 RNF91086795, HP P6635c, NEC PC-GV296VZGL, Itautec LX202, HP GU622AA-ABE, Compaq RK531AA-ABG SR1985AN AP680, HP EG601AA-AB1 a1212k, NEC VERSAL2100 RND41065495, Fujitsu PRIMERGY TX140 S1, IBM 2668WCG, Toshiba SATELLITE C855-1TE, NEC PC-LL3509D, and more.
A4tech Op-50d 401.12311/17/201412/30/2016lbeqgx-401.123.exe49kbSony VGN-CS160F, Lenovo 7659WH9, Sony PCV-RS216, HP 110-009el, SAMSUN M2410, Packard Bell Imedia I5800, HP HP Compaq nc6400, Acer Aspire 5950G, Gateway DX442S, Positivo POS, LG S525-GF4WKN, IBM 8184RUM, Panasonic CF-F9JYFCDR, Sweetwater Sound CS250, WIPRO Wsg15886, Acer TM6595, MSI MSI Notebook EX630, and more.
A4tech Op-50d 1.134079/13/201412/27/2016-1.13407.exe71kbSeneca Pro38611, HP 27-1015ef, HP NP189AA-ABA s5160f, HP RF772AA-ABF t3611.f, Packard Bell EASYNOTE SW85, HP VN310AA-UUG HPE-020be, HP HPE-367c, Acer Veriton X2631, HP KZ241AA-AR6 p6020l, Toshiba SATELLITE C870-12E, Sony VGN-TZ27FN, Panasonic CF-W7BWHNJR, Sony PCG-GR5F_BP, Toshiba SATELLITE P300-160, and more.
A4tech Op-50d 1.1222.189/22/201412/29/2016og-1.1222.18.exe79kbNEC PC-LL560MG3ER, HP PY198AV-ABA m7360y, Dell Inspiron N5040, Compaq EC516AA-ABH SR1519NL NL530, Acer TravelMate 250, Toshiba SATELLITE L850-1J9, Panasonic CF-72TCJWZPM, NEC PC-MY18XAZE1XTA, HP FL379AA-UUZ m9480ch, Acer TM6495T, VIA 2021, HP H9-1168hk, Packard Bell EasyNote_MX36-U-051, and more.
A4tech Op-50d 1.11.19422/11/201512/29/2016a4tech_op-50d-1.11.1942.exe145kbHP KZ241AA-AR6 p6020l, Gateway 6840, HP DY149A-ABU, NEC Express5800/56Xd [N8000-576, Gateway GT5082B, Lenovo ThinkCentre M58, Fujitsu LifeBook T4310, LG P1-JPLCY, IBM 8190LGJ, MSI GE620, HP AV890AV-ABJ e9280jp, Dell Studio 1557, Acer Aspire M5800, and more.
A4tech Op-50d 99812/7/201412/30/2016a4tech_op-50d-998.exe81kbHP HPE-380jp, Sony VGC-JS53FB_P, Lenovo 00P5095, Intel OLFV, HP Vd019aar-UUW, Sony VPCEJ3D1E, Buympc MPC365, IBM Lenovo ThinkServer TS200 -[652512G, WIPRO WSG37425V-0038, Sony VGN-FJ78SP_W, Gateway M-7332H, Compal HGL30C, HP PG129AA-UUZ, Panasonic CF-30KAP002B, HP NY438AA-ABA p6115y, and more.
A4tech Op-50d 732.1289/6/201412/28/2016a4tech_op-50d-732.128.exe97kbAcer Veriton Z290G, ITSUMI ADAX, LG R580-U.ARC2BT, ASUS G750JX, HP HP Compaq nc6400, HP RZ433AA-ABV, Fujitsu FMVNX95SD, Fujitsu FMVXDBJH2Z, Gigabyte GA-6PXSV3, Panasonic CF-19LCRDX6B, HP Compaq 610, Sony VGN-P50_G, HP PS384AA-B1U, IBM 8307KSU, Fujitsu CELSIUS W380, IBM 8145LUC, HP Presario V4000, Fujitsu FMVF705BDR, Fujitsu FMVDC2A041, and more.
A4tech Op-50d A801.12.191/11/201512/30/2016a4tech_op-50d-a801.12.19.exe69kbNEC PC-LL550VG3EW, Seneca Pro300475, Acer TravelMate8472TG, Toshiba PT10ABX, BenQ Joybook P51, Lenovo 1952T60, Sony VGN-FE90PS, ARLT Computer Produkte Mr. Whisper X R3, LG R590-PR70K, HP HP Pavilion DV6, and more.
A4tech Op-50d 702.14210/25/201412/27/2016a4tech_op-50d-702.142.exe114kbMiTAC 9008D, Lenovo ThinkCentre M72z, HP HP Compaq 8710w, Acer NC-E1-531-B9604G, IBM Razo, Compaq PW750AA-ABF SR1428FR FR520, HP RR521AA-UUW, LG S1-M402E1, IBM 8123W8E, HP Compaq 420, Compaq NQ905AA-ABU CQ5012UK, Gateway MC7813G, Lenovo 2756AF8, MEGAWARE Mage All-In-One, HP CQ1140JP, Sony VGN-TZ330E, Sony VGN-FE570G, Lenovo 6458V35, Fujitsu FPC03050DK, and more.
A4tech Op-50d 3092.1412/24/201412/30/2016a4tech_op-50d-3092.14.exe115kbHP FJ470AAR-ABA m9357c, Toshiba Dynabook EX/33JK, Compaq DQ193A-ABZ S5300IT IT340, Panasonic CF-19TH187QW, NEC VERSAE6300 RNF41103088, Toshiba Satellite S50-A0317, Packard Bell EasyNote TM01, HP Presario C300, Fujitsu AMILO Li 2727, Toshiba Qosmio F50, Sony VGN-NS180D, LG S1-M402E1, and more.
A4tech Op-50d K2422.112/15/201412/30/2016a4tech_op-50d-k2422.1.exe127kbLenovo 3000 V100 Notebook, NEC E6500, Panasonic CF-52AJCBDBM, Sony VGN-FJ90S, Toshiba SATELLITE C55-A-1CR, HP Presario R3000, Toshiba SATELLITE L850D-130, Sony PCG-GRZ615M, HP FR378AA-ABH, HP 500-018es, HP P6747ch-m, Compaq KT580AA-A2L SR5548F, and more.

Please Note: There are particular operating systems known to have problems with A4tech Op-50d:
  • Windows XP Media Center Edition 2003
  • Windows 7 Enterprise (Microsoft Windows NT)
  • Windows 7 Home Basic
  • Windows 7 Starter
  • Windows XP Media Center Edition
  • Windows 8 Enterprise
  • Windows XP Professional N
  • Windows XP Tablet PC Edition
  • Windows Vista Enterprise (Microsoft Windows NT 6.0.6000.0)
If you encounter problems with the direct download for these operating systems, please consult the driver download manager for the specific A4tech Op-50d model.
Laptop A4tech Op-50dTablet A4tech Op-50dDownload A4tech Op-50dUpgrade A4tech Op-50dUpdate A4tech Op-50d2017 A4tech Op-50dFree A4tech Op-50dData A4tech Op-50dInfo A4tech Op-50dHelp A4tech Op-50dGuide A4tech Op-50dComments A4tech Op-50dWindows 10 A4tech Op-50dVista A4tech Op-50dWindows 7 A4tech Op-50dInstall A4tech Op-50d