P = Programming. Programming occurs when a new battery is inserted into the X26 that has an updated firmware. Do not remove the battery while the P code is shown.
Once the P has disappeared, it will go through the boot-up sequence and operate normally.
The E error will occur if there was an error during programming of the device. This generally occurs if the battery was removed during a firmware update.
If you see an E error in the field, the X26E needs to be sent to Axon for inspection.