Hi,
simple answer:
Read the datasheet.
Any operation beyond the specified values are just "trial and error".
And even if it works once with one device, it doesn´t mean
* that it works tomorrow
* that it works with other temperature
* with modified code
* with onother chip
* and so on....
You will be responsible for any failure.
And if there are hunderd people telling me: it works --> I would never do this for my (industrial) equippment.
..and I hope no other does this with any equippment I use: like: airbag or breaking system in a car, elevator control....
There are already more than enough unreliable devices around, that work most of the time, but fail unexpectedly ... garage opener, kitchen machine, drilling tool .... often by mistreating the devices or because the designer didn´t care about EMC, ESD, heating ....
My personal opinoin: I hate those unreliable devices...They just cause stress.
Klaus