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This made things so much better at least on the emulator. Thank you so much.

Thanks, will do those exact steps and pm you - hopefully today in worst case by the end of the weekend

Is there any risks posting this os dump publicly please. Would my user info and passwords be included with it (I'm pretty sure i have not set them up on this calculator but just would like to know please) and more importantly i have an add-in which I promised someone not to share without their permi...

Just when I finished above I pressed some diagnostic option which made me test each key and after this showed the following [Ver/ROM/RAM TEST] OS Ver OS SUM 3B83 OK 02.02.0201 ABS SUM 5D26 OK DateO USER SUM ---- NG 2015.1127.1657 FLSH W/R ---- OK DateA RAM W/R ---- OK 2015.1116.2146 In case that als...

What is the diagnostic mode (OPTN+EXP+AC/ON) displaying in the first line? Something like: [LY755EZ MAIN] 000 Ok, so I assume you meant the screen after the one I quoted before you need: [LY755DX MAIN] 111 Hope it helps - and will do the rest later Perhaps you or Simon could share a link for the up...

I'm not in front of it yet to check but doubt there is any led there, will check but don't remember any difference. I think packaging mentioned exam mode but I assume they meant new os, not hardware. All I remember the battery cover was a bit more wobbly and specs print on the back slightly changed....

Yes, I double checked. It is fx-cg 20 taken out of sealed United Kingdom packaging stating it is good for A-levels etc. Maybe it is regional variation?

Thanks for that guidance.
The key combo gave me the following info:
Os ver 02.02.0201
DateO 2015.1127.1657
DateA 2015.1116.2146

i will upload the dump once i'm at a computor and have Simon's tool installed

Many thanks again

Thanks for that all, i will check what bootloaders i have just out of curiosity once I figured out the above. Have you ever tried the emulator? Are you on Windows? I created scripts making testing add-ins quite quick - you probably use upload and run on real hardware but if you want me to share how ...

I also meant to ask if bootloader was ever involved in verifying OS checksums and if so how does bootloader know the changed of their addresses please. Thanks again