Downgrade EG12 modem

Good afternoon.
On my device Mikrotik Chateau LTE12, after updating to the latest firmware version, a constant disconnection under load began.
I am currently unable to use any other device. I VERY ask you to help me return the firmware
EG12EAPAR01A06 .

Can you use your existing download tool? If it doesn’t work, please try to short the usb_boot and vdd_ext pin corners to make the module enter forced download mode, and then upgrade.