[michael29angelo]

My iPhone 3GS 6.1.6 can't be detected by iTunes, computer, and other softwares.

• I've already tried using another USB and another computer but it didn't work.

• The screen of my phone is completely black.

• Whenever I try entering DFU or recovery mode, it won't work.

• I tried charging the phone but nothing appears on the screen.

What should I do? It is a second-hand phone and before these events happened, I've jailbroken this phone unsuccessfully. Please, help!

[kch50428]

It may be the device is defective beyond repair.

[michael29angelo]

It may be the device is defective beyond repair.

Where exactly is the problem?

[Fit24]

You can take it to an Apple Store an have it checked, but like kch50428 said it might be beyond economical repair.