Citroen C5 x7 NG4 stereo

[GiveMeABreak]

I'll sort this for you tomorrow when I have a bit of time.

No guarantee that reapplying the firmware will resolve anything if it's an internal issue or the hard drive is failing, but it won't cost you too much to do a CF card replacement as per the guide to see if this resolves it. Note: CF Cardc is recommended as it uses a compatible ATA command set for the PATA drive. Anything too fast or modern like an SSD or faster CF Card won't work for long due to TRIM not being supported by the OS.