Mario's TinyLab

One of my colleagues, Marvin - proud owner of an iPhone4, has been fighting for some weeks with his iPhone internal microphone. Skype and Facetime stuff are working without problems but on “Radio” calls he got unsuspected mutes. The issue occurs in not deterministic intervals.

First aid,… yeahhh we have to open the phone, … operation on the open heart .

The problem must be the bottom mic. So we disassembled the bottom part of the phone.

No fancy actions here,… one two three screws open, some lever actions to loosen the glue stuff and voilà it’s open.

If it were up to me I would eliminate the apple hardware and build in a Galaxy S hardware, but marvin was dead set against it,… I don’t know why

“Update” :

We initial thought that the bottom microphone was causing the problem. It turns out we were wrong

After 3 days without mic. problems I would say the problem is the grounding screw left next to the upper microphone. The conductivity pad on the print is very small and it seems that slight corrosion which results in an increased transition resistance to GND causes the mic problem.

Have fun!

Mario

It’s been a while I updated my developer iPhone4 to custom  iOS 4.3.1.  According to statistics more than 75 % of all registered mobile iOS Devices are on iOS >= 5.0. So I decided to switch over to 5.0.1.

It would be remiss not to tell you that 5.0.1 is currently also supported as Untethered jailbreak, which I need for some comprehensive study

But here’s where the problem starts.

It’s been a while since Apple released version 5.0.1 and at time of writing the sign window is just closed. So if you build your custom ROM with your favorite RomOMagic Tool, put your device in DFU,.. fireup iTunes and start the recovery procedure,… you will end with a shine This device isn’t eligible for the requested build…… umpf WTF.

etc/hosts are ok, but iTunes cannot “sign” your ROM.

So what can you do?

First, as a brave jailbreaker you have your umbrella always with you and also a bunch of valid SHSH Blobs and the corresponding APTickets. We are interested in BLOBS for 5.0.1

Second, we need RedSnow. With this tool you can stitch (sign) an IPSW with your SHSH blobs.

Be sure to stitch only a custom ROM without the BaseBand!

voilà, no annoying isn’t eligible message,….after flashing your device should boot with a shiny new custom  5.0.1

be nice

have fun

Mario