I recently did a factory reset on my gps 84h-3 and now my navigation will not open but the rest of the icons open just find

Annie, I do not have this model of GPS, on some if it can be done, you will have to go to the menu/tools/settings/system
and choose mph or kms in units, or try clicking on the MPH being displayed and see if it gives option to change to Kms. Check the attached links,manual,instruction and guides, Good luck
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https://download.chinavasion.com/download/CVGY-TR17.pdf
How to Use Gps 84H 3
JTD GPS 84H 3 User Manual
Gps 84h 3 Fixya

Download the updates again after reset.

download.chinavasion.com/download/CVGY-TR17.pdf

www.youtube.com/watch?v=ph1iFCmKXZ0
www.youtube.com/watch?v=J6292-9mgnQ

Have you tried to "restart" the GPS by pressing the reset key at the back of the GPS ?
Usually, the media files (pictures, videos, music, text) are loaded (copied from your source/PC) to the T-Flash (SDHC) card ... and inserted into the GPS. The GPS device will recognize these files (in their appropriate formats, e.g. music WAV or WMA9 files, movie AVI, WMV, ASF files, eBook TXT files, pictures JPG, GIF, BMP, PNG files) and display the selections in their (respective) interface screens.

how do I turn off the warn speed forever I go into the manual and turn it off but when I am driving it said you are going over the speed limit thanks

How would I get my GPS 84h -3 replacement, because it is not powering up

Has not come with instructions to upgrade or download so how do I do it ?????

how can run the program gps power map z9 (installed device,ever run by touch folder now it can not run when touch the folder..)

is there a user manual for a gps 84h

I returned the product for a full refund. For me, that was a happy ending.