ViewSonic VS15197 Service Manual page 136

6. Check the region command listed in the bottom of this document.
7. Execute the cmd command from RUN to open up Command prompt window
8. Type " adb devices" to make sure the USB connection is OK.
You will find there is a device displayed under the " List of devices attached "
9. If your region is VSD241‐WTA‐US0, please type
" adb shell mmc_access w_region_apk en_US 64 " (Enter)
10. Process adb reboot forced‐recovery step again and update to user build image.
11. Go to the NVFlash_xxx folder and execute nvflash400_1G_ user.bat for image
update.
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VSD241/SD-A245/CDS245