Brick gpu bios sometimes work?

[Giant_Hunger]

I bought a used power color red dragon rx 570 and it played games very well after i benchmark it for 6 hours straight i was very happy with my purchase. But when i check gpuz and its bios is a gigabyte rx 570. I remembered there is dual bios switch on the red dragon rx 570 thinking that if i switch to the other switch then it would boot up with the original power color bios. After i switch the lever from left to right it did not boot up so i switch it back to the original posistion and it did not work as well. After that i freak out and put the card to an igpu system to flash with the original bios(https://www.techpowerup.com/vgabios/192289/powercolor-rx570-4096-170330) using atiflash. atiflash said the flash is sucessful so i reboot the computer and it still wont post.

 

I gave up at that point, 2 days after that i try to fix it again, i put the gpu back to the system and it boots up completely fine with the old gigabyte bios, i was happy so i restart the computer to see if the card would boot up normal and it works fine untill the 3nd restart after the 3rd restart it didnt want to post again, so i waited for another day and it boots up completely fine. 

 

This is very weird. Luckily after i boot it up with a working bios i did save the giabyte bios just to be safe.

 

So what should i do? curently the rx 570 is still running with a working bios along with my rx 5600 xt.

Should i just reflash with the powercolor bios or should i just reflash it with the bios with the working gigabyte bios ?