Filter
Top Products
M851 WristApp Design Guide Rev 1.2
Timex Corporation 121
Connect the watch to the PC using the USB cable. Once the watch displays “COMM READY”, click on
the “Download” button of the utility.
NOTE: The M851 WristApp Download Utility can be executed directly. It is located in the
C:\M851\BIN directory.
If the downloaded WristApp has some execution errors, it may break the system by overwriting system
variables or writing to hardware and LCD registers. This would lead to unpredictable operation on the
watch. In most cases, the system can detect certain conditions and automatically initiate a reset of the
watch. If the automatic detection does not work, then the following steps below can be taken to reset the
watch.
• Initiate a software reset. This involves by first pushing the crown in, then holding all the three
buttons (2 side pushers and 1 top pusher) down for 4 seconds (or whatever time the nightmode
toggle duration was specified). The software reset will work only if the watch OS is still working.
If this procedure does not work, then the hardware reset described next is the only procedure that
will work.
• Hardware reset. This requires a jewelers screwdriver to open up the case back (4 screws) and
shorting the two pads indicated by the battery label marking (RESET or A/C) and an arrow
pointing to the reset pads.