Amiko Mini Combo extra CH456H

[EI64DJC]

HI all
I Have an Amiko mini combo extra full HD Conax card reader, Don’t know model number but, chip number CH456H and It’s T-DVB C-DVB S/S2-DVB receiver.
I did a search of Astra 2 satellite and saved it to USB to rearrange the order with ali channel editor. Saved list to USB as default data base instead of user data base. When I reloaded the channel list into the Amiko mini combo extra and reset the receiver, the receiver never booted. Now stuck ON and on and no video output.
Tried to locate original firmware for this box with RS232 to USB PC with no suggest.
I’m not sure if had the proper firmware version. Searched the internet for hours and no suggest. Also, I have a RS232 to USB cable and its a 4 pin audio jacks. But, not sure is the pin configuration is correct.
I attach images of the Amiko Mini Cambo ertra.
Does anyone have step by guide to recover the box.
Thanks for reading this post
Have a good day
Bye for Now