Original Firmware?

[jdw1023]

Hi, just wondering if you have a dump of the original firmware that came with this device?

[biemster]

Unfortunately I don't. I also seem to remember that the ch552 is read protected?

[jdw1023]

Upon searching, it appears that the ch552 is indeed read-protected. Although it seems that (perhap in some version?) the bootloader have a vulnerability that allows brute-forcing the firmware byte by byte by using the verify command.

rgwan/librech551#7
https://www.youtube.com/watch?v=BVWLijlnwQI

[kaechele]

Unless you find a version that comes with an older bootloader than 2.40 then there may be a chance to dump the original firmware with the tricks mentioned above. But with bootloader 2.40 it is no longer possible, and this is what my device has.