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L3++ how can i flash back Official firmware from hive

i have L3++
when i flash hive fw meet “installer not signtured”
“If there is an error Cannot Find Signature!!!, then before flashing to Hiveon flash your ASIC with this file and repeat the process of flashing with the Hiveon firmware file.”
so i flash this file fist ,zhen hive fw flash success
now i want to flash back bitland`s Official firmware ,and i meet “installer not signtured” again
sd card flash tried, fail
who can help me

Tried using the sdcard?

tried L3+ Official firmware sd . Fail
bitland donot have L3++ Official firmware sd for download
hiveon sd can flash ,but no help
so can i also like flash one file first to fix this?

help help help