Not sure if this is correct section to ask this in , please advise and move thread if wrong.

Hizpo 2 DIN Car Head Unit
1024x600 4G RAM 32G ROM ( Internal memory )
Android 8.0.0 STD not Rooted
iGO NextGen 9.18.27.687519 Jan 26 2017
nextgen by pongo / 2017-01-22 . for users 4pda.ru@gpsIt
Loaded on Internal ROM :

Flash/Download/iGO_Israel/content/map United_Kingdom_HERE_2017.Q3_170728.fbl

with numerous other maps and licenses.

My question is , is it possible to update only the UK maps ?

As we had a massive ring road put in around our local city end of 2017 and the Sat Nav gets most upset with me driving through fields all the time !!

I have some experience with Linux systems , however after reading for the last few hours on this forum I see how easy it is to go badly wrong when
modifying this software , so thought I'd ask before trashing my Sat Nav , what the correct/best route to go is and what are the easy mistakes.

Hoping one of you clever people can spread me some light on the situation.