Thanks jon_slider, I’ve downloaded those hex files. And some other hex files that I’ve found through some other threads.
I have dupont wires and pogo pins leftover from my old Arduino projects. I have installed ZFlasher AVR on my Android phone. Now I need to source a USB to Serial TTL adapter locally.
I’ve found so many good informations in this thread : https://budgetlightforum.com/t/sofirn-sc21-mini
I’m really motivated to do the reflash on my SC21 Pro (Andúril 1). I have TS10 with Andúril 2.0 and really love the improvements over Andúril 1.