hi, i have a n900 device that is sim locked to some italy operator
( i think it is italy because of this number behind the battery 0574385 ) , i dont know which operator.
my firmware version is 3.2010.02-8 pr 1.1.1
i try updating with flasher and the process completed succsessfuly but
when i turned on the device it started booting and never end, the five dots just kept on roling forever.
i tried several times, same thing happens.
only when i flash back on 3.2010.02-8 pr 1.1.1 the device boots up fine.
i tried flashing the eMMC image but again the same happens.
and when i go to settings and tap at the top i get this option: enter code for unlocking sim card


i have two questions:

1. is it possible to update my device to pr 1.3 and how?
2. is there a way to unlock my n900 to be possible to use other sim cards like in serbia (telenor) or is there any way to get that code for unlocking?

sorry for my english.
please help me, thanks in advance.