Thanks again, I think I am getting closer. I have now downloaded fxRemote.exe, original 2.0.3.26 version, and as mentioned previously I have the patched file “fx9860g(sh3)2.04_to_fx9860gslim.bin”. I guess the latter is my OS upgrade image for the Slim calculator. As I understand the procedure, the n...

Hello, thanks very much for the reply. I still do not really get it, however. Isn’t the bin file for fx9860GII/ graph 75-95 2.04 SH3, called 2.04.bin, that I downloaded from the top of this thread and patched yesterday the same bin file as the SH3 edition of OS 2.04 you refer to in the enclosed link...

Hello, Thank you, that was a first breakthrough. I have now patched the 2.04 bin file with the slim patch and acquired the bin file "fx9860g(sh3)2.04_to_fx9860gslim.bin". The next questions is what do I do with this file? I still do not understand how to apply the instruction steps A-E, or...

Hello, I am quite new to upgrading calculators and to this forum, having only worked with more vintage calculators before. For these, re-soldering is more common than firmware re-programming. I have just bought an fx9860G slim, and found that it was possible to upgrade to OS 2.04, today there is OS ...