I'm trying to add SLIC 2.1 on a HP 250 G5 laptop with UEFI Insyde bios. I have unpacked the bios update, identified the correct BIN file, did the RW everything, used the Phoenix Tool 2.66 to insert the SLIC file. But I can't flash it. I can't find any InsydeFlash tool that works on this laptop, and trying from recovery does not work becuase the bios comes with a signature file (.s12) that does not match when modified with the Phoenix Tool. When trying to flash from recovery, if I don't include the signature says "no signature found", and if I use the original signature, refuses with the error of "invalid signature". Where I can download a InsydeFlash utility that is able to flash without signature? Or is there a way to generate the RSA signature for the modified bios?
Where is the signature check? Is in the bios itself or only on the flashing software? Is there a chance to flash the modded bios using another software, or using an EEPROM flasher?
Thanks for your answer Serg008. Then, You tell me that the one way to modify my Insyde BIOS is extract or desolder my IC BIOS in my mobo to reprogram it with the SPI Programmer? I can buy that device but I don't know how to use it correctly. In your last linsk is the complete steps to do it? Thanks.