How do I fix Bad bootloader arguments error?

[AC Question]

When I start my ZTE T77 at upgrading mode it returns the system recovery utility, but I can't flash the tablet. The reason is:

E:Bad bootloader arguments
"(null)"
E:failed to mouknt /sdcard (No shuch file or directory)
E:failed to mouknt /sdcard (No shuch file or directory)
E:failed to mouknt /sdcard (No shuch file or directory)
E:failed to mouknt /sdcard (No shuch file or directory)
E:cannot mount /sdcard (No such file or directory)
E:Can't mount /sdcard/factory_update_param.aml
E:unkow volume for path [/udisk/factory_update_param.aml]
E:Can't mount /udisk/factory_update_param.aml
E:Error in /cache/recovery/last_log
(Read-only file system)
E:Can't open /cache/recovery/last_install

otherwise I insert a bootable sdcard with factory_update_param.aml file with the .img file refered into its script is retourned the screen:

E:Bad bootloader arguments
"(null)"
Finding update package...
E:unknow volume for path [/install.img]
E:Can't mount /install.img
Installation aborted.
E:Error in /cache/recovery/last_log
(Read-only file system)
E:Can't open /cache/recovery/last_install

I've tried set rw to system directory by the adb shell us command prompt and that didnt work.

Please can anyone tell me what to do definitely?

Thank you!

 

[the tall guy]

Duplicate post.