I cannot factory reset my phone, ASUS ZENFONE 3 MAX ZC520TL

[mutmainnah_zulk]

Many of my applications have stopped unexpectedly and I can't do a factory reset after I update my a

[mutmainnah_zulk]

Many of my applications have stopped unexpectedly and I can't do a factory reset after I update my android to oreo

[Christine_ASUS]

Hi mutmainnah.zulkifli2000
Thank you for your asking. Have you try the factory reset in recovery mode? Please try following steps to access recovery mode.
1. Keep pressing "volume down key"
2. Press "power key" and stop press " power key" once you feel the vibration
3. Still keep pressing "volume down key" and stop press "volume down key" once you enter [Android Recovery] Screen
4. Choose "Wipe data/factory reset"
#Hardware Reset Guide
https://www.asus.com/support/FAQ/1006346/