While i beleive the newer peripherals work with the old europlex panels in this case i doubt it. You may be able to firmware update all the the way to current versions then newer peripherals will work but rf frequenc
ies have changed over the years etc
please see this link
https://www.securitywarehouse.co.uk/catalog/index.php?main_page=advanced_search_result&keyword=grade+AND+3+AND+flush&categories_id=44&manufacturers_id=&pfrom=&pto=&dfrom=&dto=
Both have good wireless options but id be wary of anyone giving away apps for free etc. These things do cost to run and often the free ones have less reliability.
I must admit nor me. If the fuse is in tact I'd check the trace. If you meter on other ground etc do you get a reading. I cant recall but are these power connectors on plug on blocks?