stich86 ,Play is a polish operator , and on polish market these MF286D ara availble. This ofw is presented as CR_NTTPLMF286DV1.0.0B02 , and it have a lot of bugs and lacks ( PIN code not working , no turn off lights , no select agregation ) , and till now no any OTA update. Generally this ofw is suck , that is why it is good to have such Framework , with could change its ofw i.e. to Nordic.
What i can see, not all Frameworks are "ZTE orgin" , some of them are modified. I'm looking a person ,who modify them ,and perhaps he is able to do very quick modification for changing a Play to another ( without comming back to Play again ). So i don't want a Framework with PLAY ofw , i need a Framework with any other ( Nordic , Elisa) with could erase PLAY - now i got "incorrect version" information , and need a serial to substitute version , then will work.
One pice of it i was able to change to fully Nordic ( almost , since IMEI havn't matched , and firsts OTA didn't worked without substituting) , but this requires serial converter , substituting versions .... Modiied Framework will do whole job...
BTW. I tried to modify a Framework substituting root_uImage , with changed Nordic to Openwrt (without opening and commecting serial converter) with succes.