[Asus ZenFone Max Pro M1  Guides, News, & Discussio] Bap062:
Hello friends,

As many of us know this but when i was searching no one told me...and i found this from too many forums and posted here if it is helpful someone.....

As you guys know that if you have unlocked bootloader officially then even after relocking bootloader the OTA functionality does not work..Asus server blacklist your phone serial number and imei so you cant receive any OTA...

There are several methods if you want to update

1) download full firmware from asus site (~around 1.5 GB for single version) place it to internal storage and reboot phone.

2) via fastboot method but here there are no all versions are available as fastboot rom. Refer this thread for that : https://xdaforums.com/asus-zenfone-max-pro-m1/how-to/guide-revert-to-stock-rom-lock-t3798420

3) download ota file and install through stock recovery by adb or sd card.

BUT IF WANT TO GO SOME PERTICULAR VERSION LIKE 337 OR 050 AND WANT TO STAY AT THAT VERSION THEN BY FULL FIRMWARE VERSION IT IS VERY DATA CONSUMING.

INSTRUCTIONS:

=>Just simple trick is just download OTA file from links provided below.

=>Place that file to the root directory of internal storage of phone.

=> Rename that file from WW_Phone-15.2016.1810.334-20181019-WW_Phone-15.2016.1810.337-20181106_fota.zip to UL-ASUS_X00T-WW-15.2016.1810.337-user.zip ( taking .337 version as reference just do rename as like above not same...if yo want to go from 334 to 337)

=> Just reboot your phone and you will see update notification...click on that and your phone will update as like officially you download ota and ota installs...

REMEMBER ONE THING YOU HAVE TO FOLLOW THE SEQUENCE OF UPDATE AS THEY RELEASED BY ASUS....YOU CANT GO DIRECTLY FROM 334 TO 340 WITH THIS TRICK YOU HAVE TO DOWNLOAD 337, 338,339 AND 340 OTA FILES...FIRSTLY INSTALL 337 THEN 338 THEN 339 AND LAST 340...

OTA VERSION SEQUENCE

.334

.337

.338

.339

.340

.050

.053

.056/.057

.058

There are some old versions but 334 fastboot rom available so i not included them.

.337 (82.7MB)

https://fota.asus.com/delta_package...9-WW_Phone-15.2016.1810.337-20181106_fota.zip

.338 (292MB)

https://fota.asus.com/delta_package...6-WW_Phone-15.2016.1811.338-20181206_fota.zip

.339 (492MB)

https://fota.asus.com/delta_package...6-WW_Phone-15.2016.1901.339-20190108_fota.zip

.340 (432MB)

https://fota.asus.com/delta_package...8-WW_Phone-15.2016.1902.340-20190216_fota.zip

.050 (1.5GB)

http://fota.asus.com/delta_package/...6-WW_Phone-16.2017.1903.050-20190401_fota.zip

.053 (1.5GB)

https://fota.asus.com/delta_package...6-WW_Phone-16.2017.1905.053-20190513_fota.zip

.056 (114MB)

https://fota.asus.com/delta_package...3-WW_Phone-16.2017.1906.056-20190722_fota.zip

.057 (177MB)

https://fota.asus.com/delta_package...2-WW_Phone-16.2017.1906.057-20190816_fota.zip

.058 (142MB)

http://fota.asus.com/delta_package/...6-WW_Phone-16.2017.1908.058-20190903_fota.zip

.340 is last version of oreo

Maybe this should also work in unofficially bootloader unlock and relock but i not tested it...i done bootloader unlock by officially method and relocked through fastboot method to .340 and from then i updated to .337->.338->.339...but it will work for all next version.....you can also do full firmware method-1 at any stage as mentioned on above....

CREDITS: ALL WHO ARE RESPONSIBLE FOR LINKS AND TUTORIAL