Thank you EorM for your quick answer. I will look on it. I think this all need not only 'reading, reading and reading again', it need time and peace too. Its good to have time to make this. Therefore, i will see what i can do in the next weeks.

My first Nxx0 was the N900, i reflash it only one time. The N810 i got it later.

Yes, i love linux and therefore i decide to bought my N900 after N95. This one of the best decission.

Now, normaly i use my Jolla (I love it), but i let it drop down to floor. I'm really angry about myself!, the touch is completly cracked. I think, i will let it repair in future, it cost something like 220€ at this moment. Jolla wrote, it will be cheaper in future.

Other question, can i use Mini-SD Cards with more than 8Gb, e.g. 16Gb or 32Gb? Is it possible?