Thanks for the link.
As it is mentionned here, for programmable devices it is necessary to contact directly Digi support.
I’ll try this option.
“If you have a programmable XBee, contact Digi Support for troubleshooting.
The recovery procedure outlined in this article are for standard XBees and other Digi RF products. A programmable XBee has a secondary Freescale processor that takes priority over the module’s UART and as a result has to be recovered over-the-air or while in bypass mode. The procedure for recovering a programmable XBee varies depending on the situation, and is best done over-the-phone with a technical support member.”