funny, looks like everybody has different problems

I am the fresh owner of MPP
it came with FW 01.04.0000
man oh man, opening the top case was horror (I didn't want to break it completely)
internal SD card installed successfully
I tried to use DUMLdore 3.0 to flash 01.03.0700, I followed instructions from
latest digdat0's video, but it didn't work - it was showing, that it was flashing, but in the end FW stayed the same (I repeated maybe 3 times)
so I took DUMLdore 2.12, this time the flashing procedure took much longer and it worked!
I downloaded FW 01.04.0000, I deleted module files 0305, 0306 and 0905 from bin and this time flashing with DUMLdore 3.0 worked
DJI Assistant 2 1.2.0 displays I have 01.04.0000- , parameters' configuring works fine, I'd say all is good - I hope the first flight will be fine too
one more thing, MPP wasn't activated and it was locked at the beginning
unlocking also didn't work with DUMLdore 3.0, luckily it worked just fine with DUMLdore 2.12