My question is very easy: do I have to unlock the bootloader on every single phone to change its rom or its firmware, or someone need it and someone doesn't?
Unlocking bootloader to change rom or firmware
Question
Answer
The answer is also easy: some don't need it.
Most if not all AT&T/Verizon/Amazon devices are bootloader locked, yet some are popular enough that devs worked ways around it. A common-sight solution is called Safestrap.
- Safestrap for AT&T Galaxy S4
- Safestrap for AT&T Galaxy Note 3
- Safestrap for Motorola RAZR
- Safestrap for Amazon Kindle Fire HDX (3rd gen.)
Do note that, with the lockdown measure becoming heavier over the years, there's no such solution I know of for recent devices. Even for older devices, Safestrap took a considerable long time to be developed/ported.
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