sorry, I can not find the panel opened a new post so I wrote here

Model Nubia Z7 NX506J

as mentioned in the title, i cant get any twrp recovery to boot up.

i got my phone yesterday and succeeded updating it to the latest official version (V3.88 which is android 5.1.1 with nubia ui 4.0)
now i want to get a custom recovery
problem here is, i tried several versions that i found here and everyone doesn't boot up (just stays at the nubia logo)
i tried to flash it via fastboot of course. it gets flashed (command prompt returns "OKAY")
in fact everytime i reboot to android the recovery gets replaced automatically by the original one (at least thats how i think it happens). that means if i try to enter the recovery after i rebooted to android, the old original nubia recovery got restored.
am i missing a step or am i doing something wrong?
pls help
thanks in advance

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