[Asus ZenFone Max Pro M1  Questions & Answers] souvikultimate:
D:\m1\m1\WW_ZB601KL(ZB602KL)_15.2016.1902.340-20190216>fastboot getvar all
(bootloader) hw-revision:10000
(bootloader) CPU:SDM636
(bootloader) platform:sdm636
(bootloader) secret-key-opt:NcIWPcXbQCRAZNMYptNanb
(bootloader) build-type:user
(bootloader) unlocked:yes
(bootloader) off-mode-charge:1
(bootloader) charger-screen-enabled:1
(bootloader) battery-soc-ok:yes
(bootloader) battery-voltage:4000
(bootloader) version-baseband:
(bootloader) version-bootloader:ZB601KL-0x01-20191125111155
(bootloader) erase-block-size: 0x200
(bootloader) logical-block-size: 0x200
(bootloader) variant:SDM EMMC
(bootloader) partition-type:userdata:ext4
(bootloader) partition-size:userdata: 0xCEB7FBE00
(bootloader) partition-type:version:raw
(bootloader) partition-size:version: 0x20000
(bootloader) partition-type:factory:raw
(bootloader) partition-size:factory: 0xA00000
(bootloader) partition-type:priv:raw
(bootloader) partition-size:priv: 0x80000
(bootloader) partition-type:asdf:raw
(bootloader) partition-size:asdf: 0x2000000
(bootloader) partition-type:ADF:raw
(bootloader) partition-size:ADF: 0x2A00000
(bootloader) partition-type:APD:raw
(bootloader) partition-size:APD: 0xC800000
(bootloader) partition-type:recovery:raw
(bootloader) partition-size:recovery: 0x4000000
(bootloader) partition-type:cache:ext4
(bootloader) partition-size:cache: 0x15E00000
(bootloader) partition-type:vbmeta:raw
(bootloader) partition-size:vbmeta: 0x10000
(bootloader) partition-type:rawdump:raw
(bootloader) partition-size:rawdump: 0x8000000
(bootloader) partition-type:storsec:raw
(bootloader) partition-size:storsec: 0x20000
(bootloader) partition-type:sti:raw
(bootloader) partition-size:sti: 0x200000
(bootloader) partition-type:logdump:raw
(bootloader) partition-size:logdump: 0x4000000
(bootloader) partition-type:frp:raw
(bootloader) partition-size:frp: 0x80000
(bootloader) partition-type:asusfw:raw
(bootloader) partition-size:asusfw: 0x4000000
(bootloader) partition-type:devcfgbak:raw
(bootloader) partition-size:devcfgbak: 0x100000
(bootloader) partition-type:devcfg:raw
(bootloader) partition-size:devcfg: 0x100000
(bootloader) partition-type:keystore:raw
(bootloader) partition-size:keystore: 0x80000
(bootloader) partition-type:misc:raw
(bootloader) partition-size:misc: 0x100000
(bootloader) partition-type:persist:raw
(bootloader) partition-size:persist: 0x2000000
(bootloader) partition-type:modemst2:raw
(bootloader) partition-size:modemst2: 0x200000
(bootloader) partition-type:modemst1:raw
(bootloader) partition-size:modemst1: 0x200000
(bootloader) partition-type:ssd:raw
(bootloader) partition-size:ssd: 0x2000
(bootloader) partition-type:fsc:raw
(bootloader) partition-size:fsc: 0x400
(bootloader) partition-type:bluetoothbak:raw
(bootloader) partition-size:bluetoothbak: 0x100000
(bootloader) partition-type:bluetooth:raw
(bootloader) partition-size:bluetooth: 0x100000
(bootloader) partition-type:sec:raw
(bootloader) partition-size:sec: 0x4000
(bootloader) partition-type:ddr:raw
(bootloader) partition-size:ddr: 0x100000
(bootloader) partition-type:logfs:raw
(bootloader) partition-size:logfs: 0x800000
(bootloader) partition-type:toolsfv:raw
(bootloader) partition-size:toolsfv: 0x100000
(bootloader) partition-type:limits:raw
(bootloader) partition-size:limits: 0x1000
(bootloader) partition-type:splash:raw
(bootloader) partition-size:splash: 0x20A4000
(bootloader) partition-type:dpo:raw
(bootloader) partition-size:dpo: 0x400
(bootloader) partition-type:msadp:raw
(bootloader) partition-size:msadp: 0x40000
(bootloader) partition-type:apdp:raw
(bootloader) partition-size:apdp: 0x40000
(bootloader) partition-type:devinfo:raw
(bootloader) partition-size:devinfo: 0x1000
(bootloader) partition-type:dip:raw
(bootloader) partition-size:dip: 0x100000
(bootloader) partition-type:ablbak:raw
(bootloader) partition-size:ablbak: 0x100000
(bootloader) partition-type:abl:raw
(bootloader) partition-size:abl: 0x100000
(bootloader) partition-type:dsp:raw
(bootloader) partition-size:dsp: 0x1000000
(bootloader) partition-type:modem:raw
(bootloader) partition-size:modem: 0x6E00000
(bootloader) partition-type:mdtpbak:raw
(bootloader) partition-size:mdtpbak: 0x2000000
(bootloader) partition-type:mdtp:raw
(bootloader) partition-size:mdtp: 0x2000000
(bootloader) partition-type:mdtpsecappbak:raw
(bootloader) partition-size:mdtpsecappbak: 0x400000
(bootloader) partition-type:mdtpsecapp:raw
(bootloader) partition-size:mdtpsecapp: 0x400000
(bootloader) partition-type:cmnlib64bak:raw
(bootloader) partition-size:cmnlib64bak: 0x100000
(bootloader) partition-type:cmnlibbak:raw
(bootloader) partition-size:cmnlibbak: 0x100000
(bootloader) partition-type:cmnlib64:raw
(bootloader) partition-size:cmnlib64: 0x100000
(bootloader) partition-type:cmnlib:raw
(bootloader) partition-size:cmnlib: 0x100000
(bootloader) partition-type:keymasterbak:raw
(bootloader) partition-size:keymasterbak: 0x100000
(bootloader) partition-type:keymaster:raw
(bootloader) partition-size:keymaster: 0x100000
(bootloader) partition-type:vendor:raw
(bootloader) partition-size:vendor: 0x32000000
(bootloader) partition-type:system:ext4
(bootloader) partition-size:system: 0x100000000
(bootloader) partition-type:boot:raw
(bootloader) partition-size:boot: 0x4000000
(bootloader) partition-type:fsg:raw
(bootloader) partition-size:fsg: 0x200000
(bootloader) partition-type:pmicbak:raw
(bootloader) partition-size:pmicbak: 0x80000
(bootloader) partition-type:pmic:raw
(bootloader) partition-size:pmic: 0x80000
(bootloader) partition-type:hypbak:raw
(bootloader) partition-size:hypbak: 0x80000
(bootloader) partition-type:hyp:raw
(bootloader) partition-size:hyp: 0x80000
(bootloader) partition-type:rpmbak:raw
(bootloader) partition-size:rpmbak: 0x80000
(bootloader) partition-type:rpm:raw
(bootloader) partition-size:rpm: 0x80000
(bootloader) partition-type:tzbak:raw
(bootloader) partition-size:tzbak: 0x400000
(bootloader) partition-type:tz:raw
(bootloader) partition-size:tz: 0x400000
(bootloader) partition-type:xblbak:raw
(bootloader) partition-size:xblbak: 0xC00000
(bootloader) partition-type:xbl:raw
(bootloader) partition-size:xbl: 0xC00000
(bootloader) secure:yes
[B][COLOR="DarkRed"](bootloader) serialno:3655677[/COLOR][/B]
(bootloader) product:sdm660
(bootloader) max-download-size:536870912
(bootloader) kernel:uefi
all:
finished. total time: 0.742s

After I flashed stock rom 060 device showing wrong serial no. I tried wipe data,system,boot,vendor(twrp) and reinstalling stock rom 340 and 060 but showing wrong serial no.

Anyway to change it from fastboot or internally ?

ATM, I have xtended rom with root.