The good news is, if you set the voltage at 1.3 you haven't likely killed the chip. But with that said, just dialing in 4.2ghz on a chip, thats seems to max out at about 4.0/4.1 (unless your a super OC'er) was not a good idea at all.
As H_Frank has said you need to reset cmos, and bios should reset.
Before jumping in there and killing the CPU again, read some articles about OC your CPU/mobo combo. The more you read the less likely you are to cause damage, or have failed OC's. Take it slow and handy, start low, and work up. I've my 1600x at 3.9, 1.3v. I started low voltage, upped the multi from 36 to 38 (3,8ghz) tested stable with prime for 8 hours, upped it to 39x (3.9ghz) and its steady as a rock, and how I like it.
Test test and test again. Then you won't have too many problems pushing your chip. Manage your expectations though. 3.9 is plenty good for that chip.
The games boost OC is an auto OC. It will massively over-volt to ensure your CPU has enough vcore at 4.1 to be stable. You can use something like HWmon to watch the effect of what you are doing. Sometimes on auto the vcore can push right up to 1.5v (even though only for a split second).
The point being OC in the bios, not some software OC lie Ryzen master etc will always yield better results for OC'ing, with the lowest voltage and max stable clockspeed.
Edit: with the kind of dial in OC'ing your doing, you really need to watch your temperatures. You can see this among a lot of other values in HWMon too.