When turning on shows garmin logo and switches off and then restarts again in constant loop
? You've come here asking for help and got two suggestions. If neither helped you, and these forums are mainly user to user, then call Product Support. There is plenty of Garmin support available
Typical of a discharged battery. Charge it and all should be well
It is more likely a boot loop because the firmware has a crack. Here, he probably needs a "cure file" to be able to flash the device in preboot mode.
That's possible too but difficult to do for non experienced users. Battery check is a simple one first.
If you do not report back, it is of course impossible to say what the problem was or whether the error has been corrected in the meantime.
Will dump Garmin and product due to no proper support. Thanks