Hi, Gordon! Thanks for the (really fast) reply.
Let me give you a little more information...I don't know which Series (1.0, 2.0, 3.0, 4.0) our units are (would appreciate help on figuring it out), but we are sure about the tag of the block number and the number shown on display. I can send you a picture if you like and if it is allowed by the forum. Maybe the SN is the clue, that I can also send if you like.
Luckily we had one of block 19 changed to 470, clearly visible on display, thus we could use it along with a 470 RX :-) On the other hand we had another which is block 470 changed to 509!?!?!? that goes from 509 to 534 MHz (never heard about such a block). Even matching the frequency with a block 21 RX didn't work.
Well, unfortunately we are in Brazil and have to check up for ways to get the units to Rio Rancho.
I would love to hear about ways to do so and if you want the pictures and SNs.
Thanks again and my best regards.
Marcelo