No attorney on the website is going to advise your friend on how to "flee" the country so at to avoid facing the consequences of his convictions. Sorry.
Sadly, he should have fought the adult-level charging 2 years ago during the original case.
He might be able to reopen the case if there was some sort of critical mistake in his plea agreement, but the reality is that he has to buckle down and finish his sentence. Also, his ability to emigrate to another country is probably gone now, since other countries are not likely to approve a visa.
Clark County, NV practitioner.