![]() However, I could flash version 5.10 BIOS.ROM using the following command and bring the computer back to the initial state. It tried using /E and /EC options without success. So, I created a bootable USB stick with afudos.exe on it and tried to flash EC.ROM part. I tried to install Windows 10 anyway, but the installer didn't recognize my hard drive. However, I noticed that EC version still says 5.10 as below. I was able to enter BIOS and confirmed that BIOS was indeed downgraded to 1.70 successfully. Not knowing what to do with EC.ROM, I rebooted the computer. Using AMI's afuwin utility, I was able to flash BIOS.ROM. Also I extracted the following files from Toshiba's. Since Toshiba's BIOS flash utility doesn't allow downgrading BIOS, I downloaded BIOS flashing utility from AMI website. I'm trying to downgrade my Toshiba Satellite C55-B5202's BIOS from version 5.10 (latest) to 1.70. I'm new to BIOS world, so sorry if I am asking something really trivial.
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