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Recent batches of DuoX 2 come with Evox M8+_1.6 bios on one of the banks. You need to flip the switch because the default switch position gives the Xecuter2 bios for v1.0-1.5.
Correct..It all depends when you got the chip, previous batches of Duox2 would set the switch by default to Bank 1 (for 1.6 xboxes) so if you got one of these then its most likely flashed with m8_16. Newer batches seem to have defaulted the switch to Bank 0 (for xboxes 1.0-1.5), so if you get one of these you shold be fine since its flashed with M8+.
Although I had a 1.6B (Hynix Ram) that would freeze once in a while with the M8+, after using Yoshihiro EvoX M8 1.6B, it solved the problem (this is one out of over 50 1.6b xboxes i've done so it could have been just that system)