10/20/2016 new driver models for direct download:855
Sony Sdm-s91-b 5 stars review"The best driver WIKI ever! I wil keep coming back for sure."Eric Smalter, Boston, MA
Supported languages for Sony Sdm-s91-b
Certifications for Sony Sdm-s91-b
5 stars for Sony Sdm-s91-b "WOW! Finally my PC got up to speed!" Melany Kim 7/18/2015

Checking...for 10/20/2016 Updates

All drivers on are updated on daily basis.

However, a new version of Sony Sdm-s91-b might have been uploaded since our last site update.

Sony Sdm-s91-b Driver Download

Windows Compatibility for Sony Sdm-s91-b driver

Sony Sdm-s91-b Driver Details:

Sony Sdm-s91-b File Name:

Sony Sdm-s91-b Driver Version: 161qX0beZ

Sony Sdm-s91-b ZIP Size: 140.kb

Manufacturer: Sony

Sony Sdm-s91-b was fully scanned at: 10/17/2016
Scan Status: driver download scanOK

Sony Sdm-s91-b special revision for: Windows 8 Pro 32 bit, Windows XP Media Center Edition 64 bit, Windows 7 Professional 32 bit, Windows XP Home Edition, for home desktops and laptops 64 bit, Windows XP Media Center Edition 32 bit, Windows XP Media Center Edition 2003 64 bit, Windows Vista Home Basic 32 bit, Windows 7 Service Pack 1 (Microsoft Windows NT) 32 bit, Windows 7 Enterprise (Microsoft Windows NT) 32 bit, Windows 7 Ultimate 64 bit, Windows Vista Business 64 bit, Windows 8 Enterprise 32 bit

Sony Sdm-s91-b Download Stats:

Driver Uploaded: 9/9/2016

Direct Downloads: 44
Most Recent Download: 10/19/2016
Managed Downloads: 3827
Most Recent Download: 10/18/2016
Download Mirrors: 2
Current Delay: 25 Seconds
Driver License: Free to the general public

Direct Download Success Stats:

Reports Issued By 41/44 Users

Success Reported By 10/41 Users

Driver Download Score61/100

Driver Installation Score67/100

Overall preformance Score75/100

Sony Sdm-s91-b 2 Thumbs Up2Thumbs
Sony Sdm-s91-b 0 Thumbs Down0Thumbs
Sony Sdm-s91-b 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 3364/3827 Users

Success Reported By 2742/3364 Users

Driver Download Score97/100

Driver Installation Score82/100

Overall preformance Score91/100

Sony Sdm-s91-b 2681 Thumbs Up2681Thumbs
Sony Sdm-s91-b 159 Thumbs Down159Thumbs
Sony Sdm-s91-b 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 Sony Sdm-s91-b 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 Sony Sdm-s91-b + all other outdated drivers, and installs them all at once.

Please help us maintain a helpfull driver collection.
After downloading and installing Sony Sdm-s91-b, 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.

Sony Sdm-s91-b 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 Sony Sdm-s91-b disfunctions.

Scan performed on 10/20/2016, Computer: Toshiba SATELLITE L850-1J9

Outdated or Corrupted drivers:7/19

Device/DriverStatusStatus DescriptionUpdated By Scanner
Intel(R) ICH9 2 port Serial ATA Storage Controller 2 - 2926Up To Date and Functioning
Mice And Touchpads
VMware VMware USB Pointing DeviceUp To Date and Functioning
Microsoft Microsoft USB IntelliMouse OpticalCorrupted By Sony Sdm-s91-b
Usb Devices
Hewlett-Packard HP LaserJet 2300 (DOT4USB)Outdated
Cypress USB-lagerenhedOutdated
Sound Cards And Media Devices
IDT High Definition Audio DeviceUp To Date and Functioning
Lifeview FlyDVB-T Hybrid miniCorrupted By Sony Sdm-s91-b
Network Cards
Qualcomm Atheros Qualcomm Atheros AR946x Wireless Network AdapterUp To Date and Functioning
Microsoft Keyboard Device FilterUp To Date and Functioning
Hard Disk Controller
USB Compliance USB-masslagringsenhetUp To Date and Functioning
Nokia Nokia USB PhonetUp To Date and Functioning
Texas Instruments Texas Instruments PCIxx12 Integrated FlashMedia ControllerUp To Date and Functioning
Google USB Composite DeviceUp To Date and Functioning
Cameras, Webcams And Scanners
Brother Brother DCP-115C USBCorrupted By Sony Sdm-s91-b
Video Cards
ATI RADEON X300 Series SecondaryCorrupted By Sony Sdm-s91-b
Input Devices
Microsoft HID Non-User Input Data Filter (KB 911895)Outdated
Port Devices
MediaTek DA USB VCOM Port (COM11)Up To Date and Functioning
Sony Digital Flat Panel (1024x768)Up To Date and Functioning
Mobile Phones And Portable Devices
Acer NOKIAUp To Date and Functioning

Scan performed on 10/20/2016, Computer: IBM 8190LGJ

Outdated or Corrupted drivers:7/20

Device/DriverStatusStatus DescriptionUpdated By Scanner
Intel(R) 8 Series PCI Express Root Port #4 - 9C16Up To Date and Functioning
Mice And Touchpads
Microsoft Microsoft USB Compact Optical Mouse (IntelliPoint)Up To Date and Functioning
SMART HID-compliant mouseUp To Date and Functioning
Usb Devices
Intel(R) Hub radice Intel(R) USB 3.0Up To Date and Functioning
Sound Cards And Media Devices
ESS ESS Maestro2E PCI AudioDrive (WDM)Outdated
Network Cards
VIA Placa Fast Ethernet VIA PCI 10/100MbCorrupted By Sony Sdm-s91-b
Microsoft Keyboard Device FilterCorrupted By Sony Sdm-s91-b
Hard Disk Controller
Intel(R) 82801DB Ultra ATA Storage Controller-24CBUp To Date and Functioning
Texas Instruments Texas Instruments PCIxx12 Integrated FlashMedia ControllerUp To Date and Functioning
Intel Intel(r) AIM External Flat Panel Driver 0Up To Date and Functioning
Intel(R) Sensor SolutionUp To Date and Functioning
EPSON EPSON USB PrinterCorrupted By Sony Sdm-s91-b
Hewlett-Packard psc 1200 (USBPRINT)Corrupted By Sony Sdm-s91-b
Mad Catz Programmable Support for KeyboardUp To Date and Functioning
Cameras, Webcams And Scanners
Canon Canon MP495 serUp To Date and Functioning
Video Cards
Intel(R) HD Graphics 4000Outdated
Input Devices
Hewlett-Packard HP Link-5 micro dongleUp To Date and Functioning
Port Devices
D-Link MT65xx PreloaderCorrupted By Sony Sdm-s91-b
Sony Digital Flat Panel (1024x768)Up To Date and Functioning
Mobile Phones And Portable Devices
Acer NOKIAUp To Date and Functioning
Driver ModelOriginal Upload DateLast ModificationDriver FileFile SizeCompatible Computer ModelsAvailabilty To Instalation Manager
Sony Sdm-s91-b 61.11.19411/3/201412/30/2015a-61.11.194.exe95kbLenovo 10385DG, Packard Bell Easynote Butterfly, Compaq RK531AA-ABG SR1985AN AP680, Sony VGN-TZ37GN_N, LG V960-UH50K, Biostar Hi-Fi B85S3, HP KX614AA-B1A a6502.g, Gateway M-152S, Sony VPCW21Z1E, HP HP Pavilion dv6700, HP FR564AA-ABF m9356.f, HP H9-1161ez, Sony SVE1712P1RB, Sony VGN-SR25T_P, HP DV6 - 3206AX, Lenovo ThinkPad X200 Tablet, and more.
Sony Sdm-s91-b R232.16311/19/201412/28/2015sony_sdm-s91-b-r232.163.exe69kbIBM 811314U, Compaq DA234A-ABA 6400nx NA910, NEC VERSAL2200 RND61058988, NEC Express5800/TM700, CASPER CASPERPRO, Sony VGN-SZ77TN_C, Lenovo IdeaCentre K32010031, Toshiba SATELLITE C870-14G, Supermicro X7DB8-X, NEC PC-LL750RG1B, and more.
Sony Sdm-s91-b 808742/8/201512/27/2015cpewxngrq-80874.exe208kbHP Pavilion ze2000, IBM 2672M3G, IBM 622138G, NEC POWERMATE RD391161295, MSI U4-7302, Compaq EG215AA-ABG SR1660AN AN540, NEC PC-VK24LFW23RZH, Fujitsu Blubb, Toshiba Dynabook Satellite L45 240E/HD, Toshiba Satellite R630, Panasonic CF-30CWQAZBM, IBM 187134M, Fujitsu FMVNS1E3, Sony VPCEG26EG, Toshiba SATELLITE C55-A-128, CdcPointSpa MS-7277, Toshiba Dynabook REGZA PC D731/T7DRS, Lenovo ThinkPad X201, and more.
Sony Sdm-s91-b 72782.110/18/201412/30/2015sony_sdm-s91-b-72782.1.exe77kbHASEE U147, Lenovo ThinkCentre M57p, Lenovo 7484W76, HP KP335AA-UUW, Toshiba SATELLITE L870-16L, Fujitsu FMVNFD50B, Packard Bell IMEDIA X1300 AIO, Lenovo ThinkPad Z61t, Toshiba IS 1462B, HP GX609AA-A2L m9160f, HP P6374A-ABG 720a, Lenovo 3000 J110 Desktop, HP M7640n-ABA m7640, Olidata IPMSB/H61, IBM 8084W2J, and more.
Sony Sdm-s91-b V23302.112/10/201412/27/2015sony_sdm-s91-b-v23302.1.exe215kbPackard Bell ISTART C5410 AIO, HP Pavilion G70-457CA, NEC PC-VT1000J6FD, HP DT212A-ABU M487.UK, HP Pavilion dv4000, Fujitsu FMVWMS157T, LG E500-L.A2RBY, NEC EASYNOTE PB11400006, Lenovo 7484WWY, Compaq FQ552AA-ABA SR5616F, Panasonic CF-52VADBYFG, Dell WN09, IBM 8171VRJ, LG LG PC, IBM 8183GNG, Toshiba SATELLITE C855-1WU, Notebook MIM2280, and more.
Sony Sdm-s91-b 41.17298/29/201412/28/2015sony_sdm-s91-b-41.1729.exe31kbHP Compaq nx9020, HP HP Pavilion DV9000, IBM 819437U, KOHJINSHA APERA Series, HP PX530AA-UUZ, Gigabyte G41MT-D3PT, Supermicro PDSG4, Sony VGN-FE52B_H, Toshiba SATELLITE C870-15M, DataLogic MS-N011, Sony VGN-CS60B_Q, and more.
Sony Sdm-s91-b 1.1278910/11/201412/30/2015sony_sdm-s91-b-1.12789.exe173kbSony VGN-CS26G_R, Panasonic CF-19HH165NW, Packard Bell IMEDIA 8006, NEC PC-GL24ES8DE, Zoostorm 7010-0276A, HP P9843A-ABF 712, Sony VPCW21S1R, Toshiba SATELLITE L850-13U, NEC PC-VT5500DE1, HP BT434AAR-ABA s5603w, HP HDX9400, LG R510-K.A275K, HP HP Pavilion dv9500, Panasonic CF-18KHVCBBF, HP PL494AA-ABH, HP S5680t, NEC PC-VY20MAZ78, MSI Cyberpower Compute, AMD & ATI P030A, and more.
Sony Sdm-s91-b 722.11.122/14/201512/28/2015wx-722.11.12.exe117kbIBM 8177B1G, LG R500-U.CPCIT, Compaq VT606AA-AKL CQ3275L, HP RA956AA-ABH, MAXDATA Fusion 1000 I, Exper ACTIVEDEX144, Extracomputer D2312-C2, Lenovo ThinkPad X201 Tablet, IBM 2668W13, Sony VGC-RB41P, Medion P7618, and more.
Sony Sdm-s91-b 827283/1/201512/27/2015sony_sdm-s91-b-82728.exe124kbPanasonic CF-19KHRAXAG, IBM System x3650 M4 -[7915F2M, Compaq FR604AA-ABF SR5529FR, EMachines 3265IT, Fujitsu FMVXN0484Z, HP HP Pavilion dv2700 Notebook PC, IBM 8215VFZ, HP WK697AA-ABD p6329de, MSI ThirdWave Corporation Prime Series, Panasonic CF-53AACZYFT, Lenovo ThinkCentre A63, LG T380-LARB1E, Panasonic CF-53JAWZYDE, Lenovo 20188, IBM System x3200 M3 -[7328EAG, LG R580-U.ARC3BT, Lenovo 00P5095, and more.
Sony Sdm-s91-b 821.1081/2/201512/30/2015sony_sdm-s91-b-821.108.exe161kbLG R590-XR7WK, Sony VGN-FE17SP, Fujitsu FMVMG75YD5, HP 20-a218d, Sony VGC-JS15G_S, HP RF772AA-ABF t3611.f, HP PS414AA-AB5 W1268HK, WIPRO WIV37455-0067, Acer Aspire M7200, ASUS F80S, HP FK558AAR-ABA a6604f, ALFATRON SpA HX610, IBM 847691U, and more.
Sony Sdm-s91-b Q202.12.129/30/201412/28/2015sony_sdm-s91-b-q202.12.12.exe214kbHP RA933AA-ABZ, Panasonic CF-52RE301QW, Dimotion PCDO5V3, Packard Bell IPOWER X9075, Panasonic CF-30CASAXBM, HP P6-2485eo, ASUS U24E, HP FQ562AA-A2L m9500f, HP Compaq nx9040, Packard Bell PBIPGX, BenQ Joybook P51, HP EP187AA-UUZ, NEC PC-MY26XHZE1, and more.
Sony Sdm-s91-b A303038/28/201412/30/2015sony_sdm-s91-b-a30303.exe53kbPanasonic CF-W8FWDAJR, Intel OLFV, Sony VPCEB36FG, HP KT316AA-ABE, INVESTRONICA PTC-Q965, Lenovo ThinkPad Tablet 2, IBM 8307L9U, IBM System x3630 M3 -[7377AC1, HP RX881AA-ABA m8000, LG R490-K.ARCRE1, HP HP ProBook 4520s, HP EC581AA-B1U, and more.
Sony Sdm-s91-b 2082.1012/16/201412/29/2015sony_sdm-s91-b-2082.10.exe158kbHP GG020AA-AB3 g3085l, Acer Aspire 8943, HP P6-2007nl, Packard Bell EasyNote TR83, Toshiba PSC0LA-01C01H, EMachines 5260IT, IBM 23745U9, HP CQ3375L, Sony VGN-UX71, Extracomputer D2312-C2, Sony VGN-FW53GF_W, HP FJ422AA-UUW, Sony VGN-AW190Y, Sony VGN-TX73B_B, and more.
Sony Sdm-s91-b P2.1303910/7/201412/29/2015sony_sdm-s91-b-p2.13039.exe191kbHP HP Compaq 8200 Elite CM, NEC PC-MY18XAZ35, Sony SVE15138CGS, IBM ThinkCentre M52, IBM 1872W5A, LG LW65-KDTRV, HP EJ218AA-B14, Lenovo ThinkCentre A63, Ipex I.T.G Havre series, Sony VGN-B90PSY, HP WC702AA-UUG HPE-130be, IBM ThinkPad T21, NEC PC-VT1000J6FD, HP GC359AV-ABA a6010e, NEC PC-LL550MG1J, Sony VGN-Z41XRD_B, Fujitsu FMVA52ALPJ, HP GQ498AAR-ABA m9047c, and more.
Sony Sdm-s91-b 71.1072.111/3/201412/29/2015sony_sdm-s91-b-71.1072.1.exe185kbCompaq ER922AA-ABA SR1834NX NA661, HP DF194A-ABZ 484, IBM 8183DGU, WIPRO WSG59355W7S-0014, Shuttle XP400, HP VN294AA-UUZ p6210ch, Acer Aspire 5950G, HP RQ480AA-ABZ, Fujitsu FMVNFD75B, Sony VGN-SR36GN_B, DEPO DEPO_VIP_M8710, Advent PQG9002, Packard Bell ISTART C5410 AIO, HP EP187AA-UUZ, Toshiba Dynabook BX/31L2, and more.
Sony Sdm-s91-b 284910/8/201412/29/2015swbrd-2849.exe59kbSony VGN-NW250D, Sony VGN-CR327_W, HP VS417AA-ABF s5224f, HP KT362AA-ABU, IBM 8215A64, HP GX709AA-ABM s3310la, Alienware Alienware, Olidata IPMSB/H61, Toshiba Satellite C850D-DSK, HP EJ218AA-B14, and more.
Sony Sdm-s91-b 220741/31/201512/29/2015sony_sdm-s91-b-22074.exe178kbNEC PC-VG32SZZEJ, Toshiba SATELLITE C870D-10D, WIPRO WSG48105V-0015, Lenovo ThinkPad X220, Sony VPCCA2Z0E, HP HP PAVILION DV9000, LG B55PS.AR3500D, Packard Bell IMEDIA D5089 BE, HP HP Pavilion dv9500, Sony VPCZ23M9E, HP 810-190jp, Dell PowerEdge R220, NEC PC-VX500BD, Sony VPCF13FGX, Sony VGN-TZ92S, Sony VGN-CS16G_R, IBM 2652P5U, Sony VGN-NW120J, and more.
Sony Sdm-s91-b EC651AA-ABY, NEC PC-VL750AS, Lenovo 9482W86, Compal DL7x, Panasonic CF-53JBLBY1M, HP PS351AA-B1U, TriGem AVERATEC, Compaq PS430AA-ABG SR1380AN AN510, HP 23-d050xt, Gateway 6020GZ, LG V960-UH50K, Compaq P2800N P170X520WC25EC, Toshiba SATELLITE C850-A798, Samsung RV420/RV520/RV720/E3530/S3530/E3420/E3520, HP GQ538AA-ABD, Sony VPCJ126FJ, HP FK484AAR-ABA m9400t, LIGHTEDGE 965LTCK, and more.
Sony Sdm-s91-b F8072012/29/201412/30/2015sony_sdm-s91-b-f80720.exe96kbMSI PR420, HP PS227AA-ABE, IBM IBM System x3400 M3 Server -[7379AC1, Lenovo ThinkStation E20, HP BN496AV-ABA HPE-170t, DIXONSXP GX9000, Lenovo 00P5095, Gateway PROFILE3, NEC PC-VY25AAZR7, Fujitsu FMVF53BDWS, Sony PCG-GRX700, HP FK558AAR-ABA a6604f, Toshiba Satellite C660-2KF, Acer Aspire X5900, IBM 8142LU2, ELITEGROUP 330, Lenovo ThinkPad X1, HP VG133AA-B14 p6120be, and more.
Sony Sdm-s91-b 432.11.1412/26/201412/28/2015sony_sdm-s91-b-432.11.14.exe185kbSamsung G910, HP 700-090eg, Anhoch Goliath XD810, Fujitsu FMVD7BF010, NEC PC-MA30YMZEB, HP Presario B1900, HP HP Pavilion zd8000, Sony VPCF12YFX, Lenovo ThinkCentre A57, Lanix LANIX TITAN HX 4140, NEC PC-MY30AEZ5D6T6, HP Presario R3000, and more.
Sony Sdm-s91-b 1.189011/14/201412/30/2015sony_sdm-s91-b-1.1890.exe59kbNEC PC-VY20MAZ78, HP NB939AA-ABF IQ525f, Apple IMac8,1, NEC PC-VY16AEDERFW1, IBM Eserver xSeries 235 -[86716BG, Fujitsu CELSIUS R930, ASUS Z84J, Compaq GM442AA-ABA SR5125CL, Viglen VIG615M, HP PS318AA-ABY, and more.
Sony Sdm-s91-b E8392.1811/26/201412/28/2015sony_sdm-s91-b-e8392.18.exe158kbPanasonic CF-30CWQAZBM, IBM 187134M, Fujitsu FMVNS1E3, Sony VPCEG26EG, Toshiba SATELLITE C55-A-128, CdcPointSpa MS-7277, Toshiba Dynabook REGZA PC D731/T7DRS, Lenovo ThinkPad X201, Toshiba SATELLITE C870-162, Sony VGN-Z91DS, Compaq PC139A-ABA SR1115CL NA431, LG 15U530-GT30K, Fujitsu FMVDC2A041, Panasonic CF-19FDGCFWG, I.C.S Olivetti MK510, HP KA770AA-ABU, and more.
Sony Sdm-s91-b 830022/9/201512/30/2015xghxvhsf-83002.exe212kbGigabyte Z68MA-D2H-B3, NEC PC-GV256CLAJ, Lenovo ThinkPad T430u, BenQ Joybook P51, Panasonic CF-W2FW1AXS, HP KZ692AA-ABU m9373.UK, Panasonic CF-19FHLAXAM, Sony VGN-SZ15GP_B, IBM 2374F14, Toshiba Dynabook SS M41 200E/3W, and more.
Sony Sdm-s91-b 7272012/2/201412/28/2015sony_sdm-s91-b-72720.exe170kbCompaq Evo N610c, ALFATRON SpA HX610, Acer Veriton Z430G, HP EG158AA-ABF m7171.f, HP P6604f, Gateway T-1629, TriGem AVERATEC, HP HP Pavilion dv4 FT194EA#ABE, HP GN693AAR-ABA m9058, HP P1017A-ABE 7945, HP Compaq 420, and more.
Sony Sdm-s91-b X3327312/10/201412/27/2015-x33273.exe151kbGateway 6840, HP KZ848AAR-ABA a6510t, HP 600-1210ch, WIPRO WIV37455-0067, HP Vd019aar-UUW, HP HP Pavilion 0 Notebook PC, HP HP Compaq dc7100 SFF, HP EG158AA-ABF m7171.f, HP FJ422AA-UUW, Toshiba Satellite C850-B124, HP PS512AA-ABA a815, HP HP Compaq n6120, HP GX611AA-ABA m8300f, FIC VA250U, IBM 8115KUT, Panasonic CF-18KHVCBBF, Sony VGN-AW190Y, Packard Bell EasyNote_MX66, and more.
Sony Sdm-s91-b I1.1249010/10/201412/27/2015sony_sdm-s91-b-i1.12490.exe71kbToshiba Dynabook EX1/524CDE, NEC PC-LF7506D1FL, Fujitsu FMVLX70SDG, Toshiba SATELLITE C855-12Z, Sony VGN-SR28_Q, ECS 332, Compaq PG058AA-ABG SR1178A AN430, Gateway M-152S, Sony VGN-CS36TJ_U, HP VS179AA-ABH p6250nl, and more.
Sony Sdm-s91-b 222.1811/23/201412/27/2015sony_sdm-s91-b-222.18.exe91kbCompaq FR604AA-ABF SR5529FR, Lenovo 6458Y6X, Sony VGN-CR21E_W, NEC PC-LL708WJ01B, LG FE-225JE1, Lenovo ThinkPad T61, HP PAVILION DV6187, Compaq EV971AA-ABF SR1860FR FR620, SAMSUN R509, Extracomputer D3230-B1, LG E500-S.AP33T, Toshiba Satellite C660-196, and more.
Sony Sdm-s91-b 32271/13/201512/29/2015sony_sdm-s91-b-3227.exe40kbSony VGN-AW120D, Gigabyte GA-E7AUM-DS2H, Sony VGN-AW290Y, HP PS351AA-B1U, HP PAVILION ZV6000, Fujitsu FMVCEG45N7, Sony VGC-JS50_S, Sony VPCZ1290S, Panasonic CF-19KHRAXAM, Sony SVS1311B4E, HP 500-018es, HP HP Elite 7000 Microtowe, Compaq FR604AA-ABF SR5529FR, and more.

Please Note: There are particular operating systems known to have problems with Sony Sdm-s91-b:
  • Windows 8 Pro
  • Windows XP Tablet PC Edition
  • Windows 7 Service Pack 1 (Microsoft Windows NT)
  • Windows 8
  • Windows 7 Enterprise (Microsoft Windows NT)
If you encounter problems with the direct download for these operating systems, please consult the driver download manager for the specific Sony Sdm-s91-b model.
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