As a owner of a Samsung Onia 7 Windows Phone, I didn’t had the time of my life, ever since Microsoft started pushing out updates for its mobile operating system. To be able to update my Samsung Omnia 7 phone I needed a fix Samsung released recently. It’s an update tool to help users with the updating problem, but it turns out, there is yet another problem – some phones can’t even enter download mode.
Apparently Omnia 7 phones with bootloader version 18.104.22.168 don’t have that capability. Well it turns out that an old tried and tested trick that was used to get bricked Samsung Galaxy S phones into download mode can solve that problem. I found the solution on XDA-developers. According to comments posted a USB jig fix can be used to put the Omnia 7 into the download mode required for Samsung’s update tool.
The USB jig is a resistor (301 KOhm) that when plugged into the USB port of the phone causes the phone to reboot into download mode. It may not be the most user-friendly solution at the moment, but if you don’t want to wait for another fix or even have to send back your phone to Samsung for repair, I would give it a go like I did..
To Build the USB jig you will need:
- A micro USB plug that you can solder onto. If you are not confident with soldering or you just want a tidy solution, buy a micros USB breakout board. Otherwise, get a cheap micro USB cable and cut the sleeving off the plug with a sharp knife. You cannot just wire onto the cable because this jig uses a normally-unused pin (pin 4) of the micro USB plug which will not be connected to the cable.
- A 301k resistor. You can buy one, or make one up by joining several resistors together in series, for example 3x100k and 1x1k. The resistor value does need to be fairly accurate (I would guess within 1% of 301k) to trigger download mode. 300K seems to work for everyone so far.
- Solder the resistor across pins 4 and 5 of the micro USB plug. Do not do this with the plug plugged in to the phone as the heat could damage the phone’s USB socket. The pins are shown in this diagram (“Micro-B”). On the USB breakout board they are labelled “ID” (pin 4) and “GND” (pin 5). When the plug is plugged in to the phone they will be the pins closest to the headphone socket.
- Make sure the phone is fully switched off by pulling the battery, waiting 5 minutes, then replacing the battery. Do not switch the phone on.
- Connect the rigged USB plug to the phone. Try not to touch the pins on the back of the plug or the resistor(s) as you are plugging it in, as your skin resistance could affect the resistor value seen by the phone. You do not need to press the power button. After a few seconds the phone should go into download mode.
- Disconnect the rigged USB plug and connect the regular USB cable from your PC to the phone.
- Run the Samsung Fix tool.
This should do the trick, at least it did it for me.