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I tried downloading a ZV4 and ZV5 roms and flash it with LG UP. But the flash always fails with the following error

Error Code = 0x2BC, Invalid command response code = 0x80000121

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    Downgrading across major Android versions is hard or impossible through official means these days, since manufacturers enforce restrictions on bootloaders. – Andy Yan Mar 24 '17 at 3:25

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