[DisasterRadio] Need help for disaster radio

Hy there! I bought 2 of the d-radios on aliexpress .... they work fine ... but ... I´m not the expert with coding and flashing .... need help how to update or flash the radios .... step by step.... I´m interested in - how to use the Map function? - how to activate the GPS for timestamp ... - how can i show my position on the map ... how start an mapoverview ... - is there an app wich I can use in W-Lan mode? - can i link a smal webserver to share files ... like apk ... - can i update all the nodes via the network .... Please answer .... my english is not the best .... THX