My Powermax pro is a greek version with v4.4.20 firmware (868mhz).. It havent any modules inside except the basics (wired connections & tel line)
Please advise me to clear some things in my mind

1) I have some 433 sensors (6 door,2 QRips) .. Is it safe (for false alarms or other problems) to take some wireless zone expanders to make it work ?(sth like WR-300/4B?)
2)Is my PowerMax upgradable to v5 via serial cable ? I want to put a powerlink 2 inside.. It wants v5 or newer to work .. Basically I want to interact with the system via internet.. I read that I can do that with a TP Link router and some DIY .. Is it right ?
3)The power max pro has a PC serial input .. If I connect a cable like pc motherboards serial bracket, with a USB to Serial adaptor, can I connect from my laptop to programm the PowerMax ?If not what I should buy ?
4)The battery pack of the control panel says "recheardable" .. I meter the voltage output of the contacts (Powermax to battery pack) and reads 0.5-1.8Volts .. is it ok ?
Sorry for all theese questions but here in Greece, I cant find somebody to help me
