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dvcirilo · 08-23-2023, 07:20 AM

Hello all,

Following multiple threads here I was able to repurpose my HP 12C+ (originally with 2008 firmware and SST bug) into a HP 15C with extended memory and all.

Now comes the problem that I'd like to bring it back to its 12C origins, but the only firmware I found (HP12C+_12-12-2011.bin) here does not seem to work with my version of the hardware. There is permanent minus sign on screen, and some buttons seem to have switched positions, as the "g", that lights the "G" (close to RAD) on display, the "f" lights the BEGIN, and so on.

I have flashed this multiple times, back and forth between the 15C firmware, which works flawlessly and this 2011 12C+, which does not work, probably ruling out any hardware defects.

Does anyone happen to have the 2009 versions of the hp 12C+? From my research here, it seems that last 2009 version is from 2009-11-19.

Thanks!!