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Zenfone 4 Max downgrade

orhanocal36
Star I
Hello my Zenfone 4 Max had android 7.1.1 operating system but I upgraded to 8.1 oreo beta and how can I revert to original version? I download my old version on the asus site and put it on the micro sd card, but the bootloader gives an error in the dowland part.

1 REPLY 1

ASUS_Bot
Rising Star I
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