Vivlio light HD - pocketbook verse pro firmware

[Bmarshall]

Hello everyone
Maybe some of you can help me.
I recently bought a vivlio light hd, which is a pocketbook verse pro sold in France.
The vivlio light hd has its own firmware versionr v634.6.8.2086.
I know that it is possible to install the firmware of the pocketbook verse pro model.
The procedure for the manual update should be to hold down the forward and backword buttons at the same time and then turn on the device.
I copied the SWUPDATE.BIN file of the latest pocketbook version (6.8.3796) to the root and I run the procedure.
But the ereader does nothing.
Am I doing something wrong?
Thank you in advance.