Just bought an Asus X75VC-TY103H notebook which came preloaded with Windows 8. I need to put win 7 on it. It has bios version 202 on which hides the ability to disable Secure Boot. The latest bios on the Asus site is 201 which I believe allows for secure boot to be disabled. How can I force this bios downgrade? TIA
Well I finally got to force a bios downgrade, using Winflash /nodate from command prompt, however the 201 bios still wont allow me to disable secure boot, everything to do with UEFI is hidden. Anybody got an ideas on this?
Modified bios file as suggested with AMIBCP ver. 4.55.0070 but get error with winflash 'The BIOS file size is not valid' Just spent an hour or so searching for a solution but getting nowhere. Is the a solution to this? tia edit. Tried using AMIBCP ver. 4.53 and get error with winflash 'Invalid BIOS file'
No luck unfortunately. From the UEFI Tool: The original bios shows a capsule with bios image If I mod with AMIBCP4.55.0070 the bios just shows an image (00600800bytes) If I mod with AMIBCP4.53 the bios shows a capsule with bios image (same sizes as original) It seems that AMIBCP4.53 saves in the right format but corrupts the file and AMIBCP4.55.0070 saves in the wrong format I don't know what to do next. Thanks again for help ps. Is the EUFITool screen cap in your last post the actual X75VCAS201 file
secure capsule check the problem is now to get rid off the secure capsule check. otherwise you won't be able to flash a modified bios. please try to dump nvdata with sce from an admin cmd: SCEWIN_64 /o /s nvram.txt /h Hii.db /v /q and upload the nvram.txt file! thanks
Hi nexus76 Sorry for delay, but having troubles getting the nvram.txt file. Using AMISCE Utility Ver 2.02.1036 in cmd (run as admin) I get the following:- ERROR:4 - Retreiving Hii Database ERROR:4 - Dumping Hii Database to File I tried updating bios (modded with AMIBCP4.53) using Easy Flash in Bios Setup and it only complained that bios file was too old, so maybe the answer would be to reset the bios build date. I looked at the bios file with HxD and found 3 instances of the date (searched for 2013), changed all three to 2014, but don't know how to reset the checksums, EUFITool messages show the details but I'm not sure what to change in HxD or whether this would work. Thanks again for your help and time,
mr_chaela, did you try to use afudos for flash? I see in PCH-IO Configuration that BIOS Lock is set to Disabled by default, so you should probably be able to flash ROM files without capsule. Another way was flashrom for dos or linux. Even the bios recovery mode can be handsome in such a case. Regarding bios date: it means asus has locked the downgrade option, you won't be able to flash with ezflash, it will accept only RSA signed rom files.