XBP09-DM DIGIMESH 90-232 ADAPTER v8162 not sure about firmware

Hi

I bought n. XBP09-DPSIT-156
http://www.regaliedesideri.it/xbee-pro-900-rpsma.html
and n.2 XBee Explorer USB
http://www.regaliedesideri.it/xbee-explorer-usb.html
and n. 900MHz Duck Antenna RP-SMA
http://www.regaliedesideri.it/900mhz-duck-antenna-rp-sma.html

Hooked to the PC and flashed with different firmware before this:

XBP09-DM DIGIMESH 90-232 ADAPTER v8162

Now they link but I’m not sure if I choose the right one.

They work fine when they’re near but they loose link sometimes at 50 and sometimes at 100 meters.

Thank you