What do I have to change on my Modded Rambo firmware for the Lowrider to upload on a MiniRambo?
Or shall I start with MiniRambo firmware from scratch?
There are enough potential differences between the two firmware versions that I would start with the MiniRambo firmware and then move your mods into that version. For example the two versions have different pins files implying that pin assignments are different between the two boards, and I believe the way the driver current is set differs between the two firmware versions. All the changes you need to make should be in configuration.adv and configuration_Adv.h. You can use a diff tool like Meld to compare files between the two versions to quickly find the changes you need to move to the MiniRambo firmware.
Thanks for the reply!!