The flasher runs entirely from the PC. However, you will need the trackpad for initial setup. Use USB OTG + a mouse if necessary.
Here is the that people considered "the updated flash file":
If your device is stuck on the BlackBerry logo, experiencing boot loops, or suffering from severe software lag, installing an updated (firmware) is the ultimate solution. This comprehensive technical guide covers everything you need to know about sourcing, preparing, and installing the latest official software for your BlackBerry Bold 9790. Understanding the BlackBerry 9790 Flash File blackberry 9790 flash file updated
Removes IT policies or carrier restrictions applied by previous owners. 2. Finding the Blackberry 9790 Flash File Updated (v7.1)
The device operating system was erased, but the new OS load sequence was interrupted or skipped. The flasher runs entirely from the PC
A computer running Windows 7, 8, 10, or 11. Required Download Tools
Ultimate Guide to Blackberry Bold 9790 Flash Files: Download and Installation Here is the that people considered "the updated
If your Blackberry 9790 is stuck on a white screen, displaying an App Error 523, failing to boot, or running sluggishly, re-flashing the firmware is often the best solution.
If Loader.exe does not see your device, try a different USB port (preferably on the back of the PC motherboard) or reinstall your BlackBerry USB drivers.
Right-click and it. If you see a second vendor.xml in your user roaming folder ( AppData\Roaming\Research In Motion\BlackBerry\Loader Workflow ), delete that one as well. Step 3: Run the Application Loader