I have motorola gp2000, i cannot unlock it may i know how to unlock gp2000 manually

SOURCE: Motorola GP2000

http://www.batlabs.com/gp2000.html

Cloning
These radios support cloning parameters between a master and slave radio.
Cloning only transfers the user's settings from the master radio to the slave. Things like tuning values, serial number, etc. are not changed.
To clone a master radio to a slave (target), perform the following:

• Make sure both radios are off
• Connect the cloning cable between the two radios through the programming port
• Turn on the slave radio
• Press and hold the "A" button on the master radio and turn it on
• The master radio will display CLONE if cloning can proceed, otherwise an error will be displayed
• The slave radio will display PROG while it is being programmed
• When cloning is complete, the master radio will display END and the slave radio will reset automatically
• Disconnect the radios from the cloning cable

SOURCE: how could i program/change the freq of my motorola

I don't think that you could program/change the freq of your Motorola GP2000 manually since newer Motorola radios today everything is done by computer and programming sotfware. You need to have software for GP2000, radio interface box ( RIB) and programming cable for GP2000 radio and these devices are not cheap. The best way is to contact a local repair shop to have it done for you or find a two-way radio technician, he could do this if he has all the test equipments required.
Good luck!

Radcom907