Hmmm... HP went to printer regionalization a while back. They "claim"
it was to control grey market sales, claiming it was becoming profitable
for dealers to "ride" currency fluctuations and buy cartridges to sell
from outside of their countries.
Coincidentally, this change appeared just about the same time the EU
legislated that printers would have to provide refillable cartridges to
be sold in EU countries.
I don't know if this can be "fixed". I suppose it depends upon if it is
written in firmware or not, and if that can be rewritten.
It does raise an interesting legal question, I would think. Did HP
reveal to the purchaser that the unit was regional? If they did, then
the buyer might have been wise to have sold the unit before moving, or
have bought a replacement when he moved to his new locale.
However, if HP didn't reveal this in their manuals, the purchaser would
have had no reason to assume they couldn't use the printer in another
locale, and in that case, it seems he has a legal right to a free
exchange or repair to make the cartridges and printer work together.
I would suggest your friend contact HP where he is now and see if they
can offer a firmware change that can allow it to use the consumables
from the locale he is currently living within, or maybe they will offer
some cartridges that will work with the printer as it is.
Art