Try asking for a new box when u next sign new contract.

I wasnt successful but some people say they were.

The old box is very very long lasting but u cant do anything with it like newer android models.

looks like they dun replace free anymore.

but u need not fret over it.... the new box is a very poor box too, basically built for playtv only.

for <rm120, u can buy a separate box and do a ton of apps with it with no headaches:
https://forum.lowyat.net/topic/4722095/+180

the unifi STB is only good for unifitv channels.
but the quality is the best u can get.
so, yes, u should stick to STB to enjoy the PQ, esp the HD channels - becos this is streamed via the STB with dedicated bandwidth.
u will probably not like the PQ if u watch the same channels on another box via app becos it is rather poor IPTV.

a separate box is used for other apps although u can use playtv@unifi app for the unifitv channels - quality lower as said.
a separate box allows u to do everything else - youtube HD/4K, netflix (in SD only typically), astrogo, hbo go, iflix... all other android apps under the sun.
"TVB series", it can be live tv or VOD.
if u have an astro (with chinese/TVB pack) subscriber's astrogo id/pw, u can use the legit app on the box and watch them.
if not, u can try some other apps that might give the same but may not be complete or not totally reliable - becos they are illegit and free.

for further info on such boxes and apps:
https://forum.lowyat.net/topic/4405774/+280
https://forum.lowyat.net/topic/3115619/+1200

it takes a bit of work to get all these good stuff, take some time to read first.