Download Samsung Galaxy S8 SM-G9508 CHM China (China Mobile) G9508ZMU2CRF2 firmware

Android 8.0.0

Download the Samsung firmware for the Galaxy S8 SM-G9508 with product code CHM from China (China Mobile). This firmware has version number PDA G9508ZMU2CRF2 and CSC G9508CHM2CRF2. The operating system of this firmware is Android 8.0.0 , with build date Tue, 12 Jun 2018 03:29:18 +0000. Security patch date is 2018-05-01, with changelist 13202928.

Model	SM-G9508
Model name	Galaxy S8
Country
Version	Android 8.0.0
Changelist	13202928
Build date	Tue, 12 Jun 2018 03:29:18 +0000
Security Patch Level	2018-05-01
Product code	CHM
PDA	G9508ZMU2CRF2
CSC	G9508CHM2CRF2

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Download Odin v3.14.4

Extract the firmware file you just downloaded. You should get 5 files:
AP (System &Recovery)
BL (Bootloader)
CP (Modem / Radio)
CSC_*** (Country / Region / Operator)
HOME_CSC_*** (Country / Region / Operator)
Add each file to its respective field in Odin v3.14.4. Use CSC_*** if you want to do a clean flash or HOME_CSC_*** if you want to keep your apps and data.
Reboot your phone in Download / Odin mode (make sure your device is off) with the following button combo: POWER + VOLUME DOWN + BIXBY
Other options in case first option did not work or isn't possible.
Option 2 VOLUME DOWN + VOLUME UP then USB cable
Option 3 POWER + VOLUME DOWN + VOLUME UP
Option 4 POWER + VOLUME DOWN + HOME BUTTON
Option 5 (Note9) USB cable + VOLUME DOWN + BIXBY
Option 6 (Note10) POWER + VOLUME UP
Once in download mode, connect your phone to the PC, preferably using the original USB cable you got with your phone. Odin should detect your device and a BLUE box will show up with the COM port number. (Be sure, the SAMSUNG-drivers are installed on your PC!)
Do NOT tick any extra boxes. The only options to be ticked are F.Reset Time and Auto-Reboot.
Click the start button, wait for Odin to say 'PASS' in a GREEN box. Once the flash is complete, your phone will reboot, and you can disconnect your phone from the PC.

Download Odin v3.14.4
Extract the firmware file you just downloaded. You should get 1 file:
AP (System &Recovery)
Add MD5-file in AP-field in Odin
Reboot your phone in Download / Odin mode (make sure your device is off) with the following button combo: POWER + VOLUME DOWN + BIXBY
Other options in case first option did not work or isn't possible.
Option 2 VOLUME DOWN + VOLUME UP then USB cable
Option 3 POWER + VOLUME DOWN + VOLUME UP
Option 4 POWER + VOLUME DOWN + HOME BUTTON
Option 5 (Note9) USB cable + VOLUME DOWN + BIXBY
Option 6 (Note10) POWER + VOLUME UP
Once in download mode, connect your phone to the PC, preferably using the original USB cable you got with your phone. Odin should detect your device and a BLUE box will show up with the COM port number. (Be sure, the SAMSUNG-drivers are installed on your PC!)
Do NOT tick any extra boxes. The only options to be ticked are F.Reset Time and Auto-Reboot.
Click the start button, wait for Odin to say 'PASS' in a GREEN box. Once the flash is complete, your phone will reboot, and you can disconnect your phone from the PC.