Hi yes you can load original firmware with RedBoot. You will need to use the firmware images attached to this post.
Once in RedBoot, run these commands:
RedBoot> fis init
About to initialize [format] FLASH image system - continue (y/n)? y
*** Initialize FLASH Image System
... Erase from 0xa87d0000-0xa87e0000: .
... Program from 0x80ff0000-0x81000000 at 0xa87d0000: .
RedBoot> fconfig -i
Initialize non-volatile configuration - continue (y/n)? y
Run script at boot: true
Boot script:
Enter script, terminate with empty line
>> ip -l 192.168.2.66 -h 192.168.2.254
>> fis load -l kernel
>> exec
>>
Boot script timeout (1000ms resolution): 1
Use BOOTP for network configuration: false
Gateway IP address: 192.168.2.254
Local IP address: 192.168.2.66
Local IP address mask: 255.255.255.0
Default server IP address: 192.168.2.254
Console baud rate: 115200
GDB connection port: 9000
Force console for special debug messages: false
Network debug at boot time: false
Update RedBoot non-volatile configuration - continue (y/n)? y
... Erase from 0xa87d0000-0xa87e0000: .
... Program from 0x80ff0000-0x81000000 at 0xa87d0000: .
RedBoot> load -r -b 0x80041000 vmlinuz
Using default protocol (TFTP)
Raw file loaded 0x80041000-0x800dc8c9, assumed entry at 0x80041000
RedBoot> fis create -b 0x80041000 -f 0xA8030000 -l 0x00100000 -r 0x80041000 -e 0x80041000 kernel
... Erase from 0xa8030000-0xa8130000: ................
... Program from 0x80041000-0x80141000 at 0xa8030000: ................
... Erase from 0xa87d0000-0xa87e0000: .
... Program from 0x80ff0000-0x81000000 at 0xa87d0000: .
RedBoot> load -r -b 0x80040000 initrd.img
Using default protocol (TFTP)
Raw file loaded 0x80040000-0x802e003a, assumed entry at 0x80040000
RedBoot> fis create -f 0xA8130000 -b 0x80040000 -l 0x00500000 ramdisk
... Erase from 0xa8130000-0xa8630000: ................................................................................
... Program from 0x80040000-0x80540000 at 0xa8130000: ................................................................................
... Erase from 0xa87d0000-0xa87e0000: .
... Program from 0x80ff0000-0x81000000 at 0xa87d0000: .
RedBoot> fis create -b 0x80040000 -f 0xA8630000 -l 0x00080000 -n cfg
... Erase from 0xa87d0000-0xa87e0000: .
... Program from 0x80ff0000-0x81000000 at 0xa87d0000: .
RedBoot> fis create -b 0x80040000 -f 0xA86B0000 -l 0x00130000 -n etc
... Erase from 0xa87d0000-0xa87e0000: .
... Program from 0x80ff0000-0x81000000 at 0xa87d0000: .
RedBoot> reset
After this, It will boot into the CPE firmware.
Let me know if you have any other questions.
-Matt