Almost any phone can be altered.
Umm I could be wrong, but I think u need to be a little more specific, if u want a specific answer… few more details as to what type of "altering" u wanna do…
htc verizon/ I want to flash the firmware version for the European market.
I don't know for sure, but I think our mount points are different. Why would you want to flash a ul firmware? The wlv firmware is SIM unlocked and you can use any SIM in it.
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I'm in Russia and I want to flash the international firmware without services verizon
As I said, it may cause your phone to be a brick. You can use a Verizon one on any network, just input your carrier APN with your carrier's SIM. You can install any GPE or aosp Rom and it will not have Verizon apps on it iirc.
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And turning I can't into a version of which retails for Europe?
I honestly don't think so. A: the radios are different. The Verizon one doesn't support any 4G band except 700mhz 13 and it only supports certain hspa and edge frequencies. So it isn't the same hardware wise.
@santod040 might be able to verify my assumption that flashing an international firmware can possibly brick your device.
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No it will not work and you will most likely brick by flashing international firmware onto a Verizon one. The radio hardware is different thus making the firmware totally different. Do not do it.