I found the right pin to inject an external 10 Mhz standard (pin F + Gnd) moving JP6 by 2-3 to 2-1..
when i try to give serial command F07 : ERROR 05 NO SUCH FUNCTION.
External Oscillator Enable, is one of the several options, is it any possible way to enable ?
Perhaps is the firmware in eeprom..
F18 : TRUETIME XL ACE3 sys ver 029 GPS-XL V1.046 182-6064v007
Any supports is welcome.