![]() You need to unlock the bootloader to flash recovery, so the fact that you have a custom recovery suggests it has been unlocked, but it may have been relocked. That can be achieved by either completely reflashing the phone (which will also wipe it, so back up first) or, if the bootloader is unlocked, by flashing an official recovery. So unless you (or someone else) has done that since, there's something dodgy about whoever did the refurbing.Īnyway, if you are trying to install the official update you really want the official recovery. That wasn't done by any official service center, so I don't know who did it: any official service centre should reflash the phone with clean firmware, so even if a previous owner had installed TWRP that should have been removed if the phone was a factory refurb. However, a custom recovery will not work for installing an official, over-the-air update, and it sounds like that is the problem. The standard recovery will only install official updates, so people who modify their phones (rooting, custom ROMs) usually replace this with an unofficial "custom" recovery, and TWRP is the most popular of those. ![]() "Recovery" is a small, self-contained program that all Android phones contain, and is used for doing operations like factory reset, clearing the cache partition, or installing updates. OK, you have a custom recovery installed.
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