So, if you "accidentally" deleted some files, you must reflash.
Maybe, one day you can explain how one can "accidentally" delete files in a system folder... You had no reason to do something there if your image hadn't been fully installed yet.
There is quite a confusion in your process.
Flash the image and see if the startup wizard begins: it should, immediately after the firs reboot, if you don't touch anything.
Incidentally: how did you prepare your USB flash stick? Did you put the vuplus folder in the root and had it the two subfolders and files?
And how long should it be? the receiver first blinks for 10 seconds quickly then slowly but infinitely long ..10 seconds isn't long enough to load an image, it's probably still trying to find the image.
Forget about trying different images try different USB sticks.
http://www.vuplus.com/sub/sub0103.php
Unzip this file and transfer the vuplus folder to a freshly FAT 32 formatted USB stick.
Flashing takes a couple of minutes:
Copied from a guide:
Power off Vu+ Solo SE, using the switch at the rear, of the receiver.
Insert the USB Pen Drive, into the rear USB socket.
Power on Vu+ Solo SE
The white circular ring on the left side of the front panel will blink a few times then begin pulsing.
The pulsing indicates it's flashing the image.
Once the image has successfully flashed the pulsing will stop and change to blinking on and off.