Since you are any doing the reboot and not able to login with new password..
You may use reset button to factory reset SRX and reboot the boxes to recover.
However i do assume that you are already having the backup of the existing configuration.
Pl follow the instructions carefully for using reset button.
Using the Reset Config Button
Note: The Reset Config button is available only on the SRX Branch and J-Series devices.
You can use the Reset Config button on the front panel of the SRX and J-Series device to reset the device to its factory default configuration. The Reset Config button is recessed to prevent it from being pressed accidentally; so you need to insert a small probe (for example, a straightened paper clip) to press the button.
Caution: If you use the Reset Config button to reset the device to its factory default configuration, all the configuration files, including the rescue configuration and backup configurations, will be deleted.
For instructions, refer to the following links:
Also post resetting password, paste your config again on SRX except root password snippet..