So I am a new owner of a 2010 Peugeot 308 with RNEG head unit. After I found out that the firmware can be updated I am going to flash the 50.03 version as soon as possible. In the meantime I am doing some research on how to update the maps. As far as I understood, the latest official release was 2018-2, but there a numerous unofficial map updates.
Of course, I am trying to find the most recent one. So this one caught my eye . supposedly 2021-1:
https://www.drive2.com/l/577570160609592167/
I know, it is in Russian, but google translate does wonders here

I haven't found this map version anywhere else yet so this got me wondering if it is ok to upload it. Has anyone tried this out? Can I brick something by changing maps or can I always revert back to my current 2018-2 version in case something with the 2021-1 version goes wrong?
Thank you!