Caty on nuvi 1xx you dont see this Loader up and down,you only see Loader when you start flash.

Folow this procedure and all be OK

install Garmin usb drivers

Create cure rgn with garmin cure tool and click on updater in this tool

Now you have open updater window and add dot beside USB

Now add finger in uper left corner and hold it there

connect nuvi with other hend to PC

when you see in updater window your model number click on OK button (you must still hold the uper left corner)

Now you will see that in updater window show erasing and still hold the uper left corner of screen

Look at your nuvi screen and you will see writen Loader loading and now you can release your finger from screen and whait that nuvi end process.

When you format nuvi and add back backup you must flash in pre boot with original FW also created with garmin cure tool

When you do all this your nuvi will work