Mifi 2372 Unable to connect with USIM

[plugred]

Hi all...im new here..and need your expertise to help me on my mifi2372 problem..
I bought 2nd hand unlocked mifi2372 an using it 2month without any single problem..
Now suddenly, i can't connect to the modem..
-turn on modem as normal, then wait for the blue light come out.
-when i click connect on my notebook..it's can't connect to mifi
-then the blue light also not blinking, only the violet blinking.
-i also unable to reset the mifi..pull the battery is the only way...

so, i remove USIM(data plan)...turn on modem again...suprise..now, able to connect to the mifi and access to landing page...but when i place the USIM..same problem occurs again..is this the symptom of USIM locked?

So far what i did is.
-re flash with other firmware
1)20419181_MUU_MSM7225_Arches.ATT_AMSS_7.11.02_Lin ux_2.7.0207_2010-02-10_pkg (same problem)
2)20418764_MUU_MiFi23x2_FW5.26.2_ML3.00.57_NvtlGen eric_v1.2_pkg (not compatible)
3)firm-20418796_MUU_MIFI2352_NVTL_GENERIC_Pkg (not compatible)

Now, i feel like this modem is dead...need your expertise advice..thanks

[[email protected]]

sim problem

you change sim to new one, can slove this problem.

[plugred]

thanks for respond..i manage to flash with generic...and try to flash it back to att firmware..working 1-2 hrs and suddenly block again..believe att block it...so, reflash again to generic...now another problem occur...its give error 'Unable to upgrade modem. -Backup aborted due to missing calibration'...try for all compatible firmware...and this error still persist....i think i was bricked my mifi...hmmm...no luck...any suggestion to restore the nand fren...

[pepe000p]

Mifi 2372 - Same problem

After upgrading to the 5.28 and getting all the time Hello World! I couldnīt downgrade back to the 5.26 because I get "-Backup aborted due to missing calibration!"
Were you able get rid of this error?
Thanks

[plugred]

Hi All...anyone find out how to solve this problem..or it will remain unsolving...

[martinFr]

I also need a solution. Any ideas today?