Hello, thank you very much for your reply!
I figured out, how to flash the chip with the original - unmodified .bin file (which i dumped using CPU-Z before modifying anything). But the computer refuses to work anyway. I think, that the problem may be in the checksum you mentioned. I'm attaching both .bin files for comparison. They are identical, however, the original file is cutted off at 0x00062976 and the read file has FFs till the end (0x00131072). I found one thread
about correcting a checksum using Hex Workshop but the illustration images are gone and I'm not able to figure it out.
I would be very grateful, if you could help me with it. Thanks!