I have asus hang on logo need this version flash file and how to know model no asus in fastboot mode thnxxxxx in advance

Microsoft Windows [Version 10.0.18363.1198]
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C:\Program Files\Minimal ADB and Fastboot>fastboot devices
JCAAGF04U481BBJ fastboot

C:\Program Files\Minimal ADB and Fastboot>fastboot getvarall
fastboot: usage: unknown command getvarall

C:\Program Files\Minimal ADB and Fastboot>fastboot getvar all
(bootloader) hw-revision:10000
(bootloader) CPU:SDM660
(bootloader) platform:sdm636
(bootloader) secret-key-optZQdMZyYPkJQGfFCJTswg
(bootloader)...

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