I am Not responsible for any damage, Explosions, Nuclear Holocaust etc. this root method may cause.
Files you will need below:
1. Engineering Recovery package: Download
2. SuperOneClick v1.7: from Here Thanks to CLShortFuse
3. A GoldCard: To easily create a Goldcard in a couple of minutes without ADB skills or commands, check this thread
4. Stock firmware: Download
5.the ClockworkMod Recovery 126.96.36.199 : Download
5. a know how of how to use ADB.
- There's a good ADB learning guide here: ADB for noobs
Step 1: Assuming you already created a gold card place it in your phone and mount it place the Stock Firmware zip and update.zip on root. and unzip Engineering Recovery package and place them in your AndroidSDK in the "Platform-tools" folder.
Step 2: unzip and run SuperOneClick v1.7 and make sure your phone is connected via USB with USB Debugging ON. Now press Shell Root and let it run you should get a success pop up.
Step 3: Run ADB and type the following:
you should get your devices serial
adb push flash_image /data/local
adb push mtd0.img /data/local
chmod 04755 *
/data/local/flash_image misc /data/local/mtd0.img
Step 4: Once complete, power off the TMobile myTouch Slide
Step 5: Hold the Volume Down button while powering on until the device is in bootloader mode.
Step 6: After a minute or so, the device will prompt to see if you want to run the update. Press the Volume Up button to accept & apply the update.
NOTE: (IF YOU GET A ERROR MSG THAT THE ZIP VERSION IS OLDER THEN THE THE PHONE VERSION YOUR GOLDCARD WAS MADE WRONG!!)
Step 7: Once the device is finished applying the update, it will ask you to reboot. DON'T reboot the device & press the Volume Down button to tell the device not to.
Step 8: Back at the bootloader menu, use Volume Down to highlight Recovery and press the Power button to boot into the recovery.
Step 9: Once in the recovery, you will see a device with a triangle. Press Volume Up & the Power button.
Step 10: Use the Volume Down button to highlight Apply update.zip & press the Power button to select this.
Final Step: After a moment, the TMobile myTouch Slide will boot into the ClockworkMod Recovery.
After that you can now pull battery and insert your main memory card with your desired ROM and Radio Update if you wish and boot into recovery and Happy