Always read the specific ROM's XDA thread for latest updates, bug reports, and firmware requirements before flashing.
To install Beta 5 (438), you must already be on a specific version : Version 060, 061, 063, 082, 084, or 087. If on Android 10 Beta: Version 407, 424, 429, or 432. firmware asus zenfone max pro m1 android 10 work