Hi,

What I tested (jb obviously, ssh, smb and ftp) works on a brand new InkPad Color (741) I just got my hands on. I tried it with factory firmware 6.3.250 (20201230_092957).
That is not very surprising actually:
uname -a
Linux pocketbook 3.10.65+ #2 SMP Thu Dec 24 17:07:42 EET 2020 armv7l GNU/Linux
Linux version 3.10.65+ (jenkins@bsp-builder) (gcc version 4.9.2 20140904 (prerelease) (crosstool-NG linaro-1.13.1-4.9-2014.09 - Linaro GCC 4.9-2014.09) ) #2 SMP Thu Dec 24 17:07:42 EET 2020
So it looks very similar as the 740 reported by Marco77 back in 2019.