Commands are sent to the device using and the responses and measured values are read using - both operations are done synchronously.

Samsung 300K Tool Error 995 Download Mode But

It wont help you if you can already get into download mode but something else is going wrong with the flashing process, for example you cant get Odin to communicate with the phone.

Aug 27, 2016 GSM-Forum GSM CDMA Phones Tablets Software Hardware Area Samsung Samsung Android based phones Samsung 300K TOOL TO FORCE ENTER DOWNLOAD MODE VIA USB User Name.

If the phones bootloader is still intact, that is you see at least the white Galaxy SSamsungATT logo or the PC Phone logo on the screen, you should be able to force it into download mode by connecting a homemade jig that simulates the Samsung Anyway field test jig.

You can buy these jigs online, or make them using a micro USB plug and a resistor.

If your phone screen is always black, that is it does not display the white Galaxy SSamsungATT logo when you switch it on, then sorry, this jig will not help you.

If this helps you recover your bricked phone, please donate to the CyanogenMod developers: go to and click the link under SUPPORT US.

If you dont want to buy a pre-made jig, you can build one yourself from a few parts.

You will need: 1.

If you are not confident with soldering or you just want a tidy solution, buy from Sparkfun.

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 from, or make one up by, 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.

K seems to work for everyone so far.

Procedure: 1. Solder the resistor across pins 4 and 5 of the micro USB plug.

On the Sparkfun micro 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.

Samsung 300K Tool Error 995 Skin Resistance Could

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.

Disconnect the rigged USB plug and connect a regular USB cable from your PC to the phone, then you should be able to flash using Odin.

I have searched stackoverflow and googled thoroughly for this problem but not been able to find a clue to why this problem is happening.

I am writing a program in C which communicates with a measurement device connected through USB.

The program is multithreaded and several threads will communicate with the device.

A mutex is used to guarantee that no two threads try to read or write from the device at the same time.