Rooting and unlocking japanese Android phone - Upgrading, Modifying and Unlocking

Are there any risk for rooting it,flash a North America region rom and install a baseband that doesn't have a sim lock?

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How to use (unlock) region?

I'm still confused about how to use my phone that bought from Nordic area in Asia region? I heard about unlock sim, but some of members in thhis forum failed. What should I do?

[Q] Region unlock. downgrade

Hi all,
I have a note 2 N7100 4.3
AP XXUEMK9
CP XXUEMJ9
CSC BTUEMK2
This is unlocked to UK networks. I tried to use the phone while in Africa and Asia, while on holiday and I couldnt. So I tried to downgrade it to 4.1. Triggered knox and almost softbricked. Now back to stock as above.
I have rooted the phone with superroot and the knox has been turned off. Tried Region Lock Away (Chainfire) Didnt work.
Can I now safely downgrade to 4.1? Any experiences?
What if I ODIN an Asian ROM. Will it then take an asian SIM?
Also, has anyone managed to unlock the region lock for the new samsung phones? I was told that I have to use a UK SIM in the phone when I go to Asia and make a 5 min call. Then the region lock should go away. This was from Samsung UK tech support. Has anyone tried this?
Thanks for your time and effort

A70 European Region unlock

I need help on new Samsung model A70 Region unlock, the one way is call for 5 minutes using a sim card and phone will be Region unlocked but I need some firmware patch or method which is fast and easy. if some developer or user can suggest some thing.
jack

Change Modem (CP) for G981U1 for use in Europe?

...because I use the phone in Europe. Given the firmware is North America I was wondering whether I need to change the modem in ODIN to get better reception/ 5g in Europe. The last Samsung I owned was the S4 where updating the modem to your region was ubiquitary. Not sure if this is still necessary and doable., so hoping for some advice.
Second question: I have a US S20 locked to AT&T. Will flashing the U1 firmware (incl. factory reset) also unlock the phone?
Cheers!
tpunkttpunkt said:
...because I use the phone in Europe. Given the firmware is North America I was wondering whether I need to change the modem in ODIN to get better reception/ 5g in Europe. The last Samsung I owned was the S4 where updating the modem to your region was ubiquitary. Not sure if this is still necessary and doable., so hoping for some advice.
Second question: I have a US S20 locked to AT&T. Will flashing the U1 firmware (incl. factory reset) also unlock the phone?
Cheers!
Click to expand...
Click to collapse
You can't mix exynos firmware and Snapdragon. I doubt you can use just the modem portion of a European exynos code. You can flash U1 code freely, but that does not unlock the bootloader. Do you mean you can't put any sim other than AT&T?
I didn't mean to unlock the bootloader (since that's not possible for US phones) but the sim so I can use my German sim card in Europe in this phone.
tpunkttpunkt said:
I didn't mean to unlock the bootloader (since that's not possible for US phones) but the sim so I can use my German sim card in Europe in this phone.
Click to expand...
Click to collapse
Do you know if I run the risk to brick my device if I tried to combine the exynos modem with a snapdragon rom? Cause otherwise I might just try it.

Will changing the CSC to a supported region unlock the bootloader?

I'm in the United States with the bootloader locked. If I used SamKeyl to flash, say, a South Korean CSC and flashed a South Korean firmware, would that allow bootloader to be unlocked?
And would the bootloader remain unlocked if I flashed a United States firmware afterwards?
CSC has nothing to bootloader unlock.

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