Hey ALIZARD,
As JACOBANDNICKOLAS said previously it is unlikely that the transfer case is frozen and not coming out of 4x4LO sometimes it just the load will not allow the shift.
If it will not shift out of 4x4LO try rolling forward and backwards and then retrying the shift.
Your transmission must be in neutral when shifting.
If this does not work try the shift whilst rolling forward slowly in neutral, by slowly I mean around walking pace.
Let us know how this goes for you.
Regards, Joe
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Monday, February 17th, 2020 AT 8:22 AM