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Me and my son are living in Thailand and we've bought an second hand office laptop for him, imported from Japan. It's a Toshiba Satellite Dynabook B552/F, also labelled Pro S850, from 2012. It has an Intel HM76 chipset, i5-3320M CPU, Intel integrated HD4000 graphics, Mini-PCIE 2.0. Now we're trying to install a desktop GTX970 as EGPU through a Mini-PCIE to PCIE x16 riser card, which does seem to work with a lot of laptops. The problem is that it doesn't recognize the GPU as Basic Display Adaptor, as it should, but as an Unknown Device.I suppose this Toshiba laptop whitelisted the Wifi-card that came with it and blocks other M-PCIE cards. Am I right?
So now we need an unlocked BIOS, with more settings, so that we can make it recognize the EGPU on the Mini-PCIE port.
However, I can't find any modded BIOSes at all, only the original for A5A003305 FHFLSY1 mainboard at:
https://drive.google.com/file/d/115vzCHs...sp=sharing
The current BIOS is version 6.10, EC Version 1.00. I don't know the manufacturer of the BIOS but the screens look very similar to those of L850 and C850 Insyde BIOS.
I did find a version 6.60 BIOS update for the B452, B552 and B652 models on the Japanese Toshiba support website at:
https://dynabook.com/assistpc/download/m...ndex_j.htm
but unfortunately it doesn't work and gives an error: This computer is not supported. I did, however, manage to extract the Toshiba .COM BIOS-file, but I can't convert to .BIN by using ToshibaComExtractor. I only get a blank screen.
https://www.mediafire.com/file/kiw5uqch6...T.COM/file
Can someone help me and my son unlock the advanced menu so we can install the EGPU properly and he can use his GTX970? My son is saving for a desktop, but it will probably be only next year that we're going to buy one for him.