ZTE MF 60 (SIM Lock status : unknown(read failed))

[papvag]

Hello Community,
First of all please forgive my English
I have a ZTE MF60 (COSMOTE) Mobile Wifi Router (hotspot) and i have this problem:
When i bought this router and for as long as I used the cosmote sim card everything was ok.
Since i changed GSM service provider from cosmote to vodafone i received a new sim card which I put in the device.
Then i pressed the power button and Welcome message appears for less than a second and then screnn goes black and the router freezes.
Even if i press power button again nothing happens. I have to remove the battery and press the power button again in order to start the router but again the same (welcome screen for 1 sec and blank screen and freeze!)
Then i made a google search for an unlocker program and here i am!
I downloaded the dc-unlocker client, payed for the unlock of the specific device, getting username and password everything ok until then.
I started the dc-unlocker search for my modem...put my username and password... so far so good. But UNLOCK button was NOT active.
Then something in my modem details caught my attention: SIM Lock status : unknown(read failed) and i thought that this might be the problem.
How can i resolve this?
Thanks!

There is no card inserted during the detection time!

[Vincentas]

What sim card is there inserted at detect time? Original or other provider?

[papvag]

i insert original card and dc unlocker says "unlocked". When i insert the new card i can't even start the modem. it freezes

[Valdemaras]

Correct lock status on DC-unlocker can be received only when invalid/not original operator sim is inserted into device. What do you mean device freezes when you insert not valid sim card?

[papvag]

Like i describe in my thread when i insert a not original sim card, device starts booting (when i press the power button of course), displays welcome, then blank screen and that's all! Nothing works until i remove the battery and press power button again! To obtain a full start of the device i can either remove any sim cards or insert only the original one

[Valdemaras]

Well then sorry, this may be related to firmware of your device and we won't be able to assist on that one.