Problems w/ my philips DVD

My dvd used to read dvds regions 1 and 4…but now it doesn’t read dvds regions 4.
What can be the problem???
Is there a way to unlock region 4 again?

Welcome to CDF.

If you specify the brand of your DVD, some might help you.

philips…is in the tittle of the post

Just use DVD Region Free

Your other option is to find region free firmware and flash your drive but it voids the waranty.

There are many Philips DVDs. My statement was refering to the specification of the brand, thus helping you to find possible new firmware.