My G9x died (second time). Both time the same, mouse started disconnecting/reconnecting randomly.

As the G9x is outdated, they had to replace with another one, and send me a G600.

After they shipped, I found out the G600 has lag and no flashable firmware.

Any advise what to do now? I guess even the newest G600 still have the lag problem? Or should I open the box and test for myself, and then contact logitech support. Or contact them right away. Or just leave the box unopened and sell it to get another brand?

I only know for sure that I can't live with that lag when playing quake.