Flashing 02 firmware to an unlocked Samsung A3 which was previously locked on 02

Samsung A3
Model: A300FU
Country: United Kingdom

My phone was previously locked on 02 and my brother got it unlocked and i was able to use a Virgin sim.
Yesterday I updated the phone's software to the latest Marshmallow 6.0.1 but, now the phone is stuck on SAMSUNG LOGO for an indefinite period of time. I tried clearing the cache data multiple times but that did not work.

My questions are:
1) Is flashing going to stop the boot loop?
2) If i flash the latest marshmallow firmware which is on 02 will my phone be locked again?
3) Should i flash my phone with a firmware that is NOT on any carrier?

Please help me. Thanks

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