Hi Friends,
If you done wrong software in your box then recover/rollback your software by this recovery software given bellow

Airtec nk6605 Original Firmware

Software kaise kare ?

This All software will definitely helps you rollback your gx6605s box software , but in some cases there is problem in boxes so friends do this software at your own risk only! 

Champion 4000 Latest Firmware
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GX6605s-NK Recovery Softwares
6605-Model STB Recovery Firmwares

Softwares-1
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Software-2
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Software-3
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Wrong Software Set Top Box Recovery USB | Gx6605s USB Recovery Software All Nk_Me Board | Dead Box Recovery Nk

Note:-
I made this post only for education purpose only we do not support any types of illegal things or illegal activities.