Unlocking external hard drive that was locked with time machine

I use a MBP Retina (Mid 2012) with OSX 10.9.4.  I left the MBP at Apple for repair and they changed the mother card and reformatted my HD (SSD).  Since I had a backup on a WD My Passport external drive I was not too worried to restore.  I had clicked the option "password protected" on TM and therefore the external HD was password protected.  I also copied pasted many files on the same external hard drive, in case TM would fail one day to operate I thought that I would still have my files ...
But I was very surprised that when I plugged in my external HD into my MBP it didn't recognize it at all.  The external HD did not appear on the screen anymore.  Nor in Finder.  It appeared in Disk Utility but it could not be mounted.  Basically it was impossible to access my data.  After a while and talking with Apple Support on the phone we could reach a point where a window appeared asking me the password for the access to the HD.  Unfortunately it didn't work.  The .  password was not recognized.  Even though we had selected the right country with the icon upper right on the screen to make sure that we used the correct keyboard.
So finally I reinstalled completely the OSX (coming rom Lion all the way to the last OSX) on the MBP and finally I could restore it with my TM.  I spent three days on this since it only worked with one OSX - don't remember honestly which one -  and not the last one.  Don't know why.
Anyway. 
Today I have my MPB working but I miss all the files that are still on my external HD because I cannot access to it anymore.  As I said the recovery happened all of a sudden with TM with a former OSX and not the 10.9.4.  With this current OSX my HD does not appear on the desktop nor on finder. Nothing.  It is locked by TM and I cannot even key in the password to unlock it.  Useless to say that I have the password.
Any idea how to sort this out please ? Thanks

This might work. Courtesty of V.K.:
run the following terminal commands (copy and paste, please)
sudo chflags 0 /volumes/*
sudo chmod a+rx /volumes/*
you'll have to enter your admin password (which you won't see). that's normal. this should unlock your drives.

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