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Rps-Cheers
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In some cases, there may be an abnormality in one of the part files of these COS APs, which makes it impossible to convert to Mobility Express. At this time, you will encounter the following error.

################################################################          89.0%
################################################################          89.6%
######################################################################## 100.0%
Image downloaded, writing to flash...
[*01/09/2019 14:41:33.9399] 
[*01/09/2019 14:41:33.9399] CAPWAP State: Discovery
[*01/09/2019 14:41:33.9399] Discovery Request sent to 192.168.18.2, discovery type STATIC_CONFIG(1)
[*01/09/2019 14:41:33.9499] Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)
do PREDOWNLOAD, part2 is active part
tar: btldr.bin.lzma: not found in archive
sh: CHECK_ME: unknown operand
part.bin signature verification failure, exit the script
Error: FILE_SIZE_ZERO, not updating ubi vol
Error: '/etc/capwap-upgrade.sh PREDOWNLOAD' failure.

Check the version of the AP. It can be observed that there is no image file in the backup part of the AP. At this time, it is recommended to fill the backup of the AP with a lightweight AP image.

AP1#show version 

             Restricted Rights Legend

Use, duplication, or disclosure by the Government is subject to
restrictions as set forth in subparagraph (c) of the Commercial
Computer Software - Restricted Rights clause at FAR sec. 52.227-19 and
subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

            Cisco Systems, Inc.
            170 West Tasman Drive
            San Jose, California 95134-1706

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
         
If you require further assistance please contact us by sending email to
export@cisco.com.

This product contains some software licensed under the
"GNU General Public License, version 2" provided with
ABSOLUTELY NO WARRANTY under the terms of
"GNU General Public License, version 2", available here:
http://www.gnu.org/licenses/old-licenses/gpl-2.0.html

This product contains some software licensed under the
"GNU Library General Public License, version 2" provided
with ABSOLUTELY NO WARRANTY under the terms of "GNU Library
General Public License, version 2", available here:
http://www.gnu.org/licenses/old-licenses/lgpl-2.0.html

This product contains some software licensed under the
"GNU Lesser General Public License, version 2.1" provided
with ABSOLUTELY NO WARRANTY under the terms of "GNU Lesser
General Public License, version 2.1", available here:
http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html

Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Fri Feb 24 22:26:41 PST 2017

ROM: Bootstrap program is U-Boot boot loader
BOOTLDR: U-Boot boot loader Version 30

AP1 uptime is 0 days, 0 hours, 6 minutes
Last reload time   : Wed Jan 9 14:37:55 UTC 2019
Last reload reason : unknown
 
cisco AIR-AP1815I-H-K9 ARMv7 Processor rev 5 (v7l) with 1015956/850284K bytes of memory.
Processor board ID FGL2225XXXX
AP Running Image     : 8.3.111.0
Primary Boot Image   : 8.3.111.0
Backup Boot Image    : 0.0.0.0
1 Gigabit Ethernet interfaces
2 802.11 Radios
Radio FW version : 8edf74e05d634a962e683454e8fc1be2
NSS FW version : not available

Brush a mirror image of the backup area of the AP. Here, take Release 8.5.182 as an example. (Note that the span of the version should not be too large)

LAP#archive download-sw /reload tftp://192.168.18.2/ap1g5-k9w8-tar.153-3.JF15.tar
###########                                                               15.4%[*01/09/2019 14:52:45.2299] 
[*01/09/2019 14:52:45.2299] CAPWAP State: Discovery
[*01/09/2019 14:52:45.2399] Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)
###########################################                               60.8%[*01/09/2019 14:52:54.7299] 
[*01/09/2019 14:52:54.7299] CAPWAP State: Discovery
[*01/09/2019 14:52:54.7499] Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)
######################################################################## 100.0%

After the AP restarts, you can see that both parts have mirror files.

AP Running Image     : 8.5.182.0
Primary Boot Image   : 8.5.182.0
Backup Boot Image    : 8.3.111.0
1 Gigabit Ethernet interfaces
2 802.11 Radios
Radio FW version : 8fd6300a6e46b2e512e1452959ec6814
NSS FW version : not available

When this happens, we will use the ap-type mobility-express command to complete the ME mode conversion.

LAP#ap-type mobility-express tftp://192.168.1.2/AIR-AP1815-K9-ME-8-5-182-0.tar

After the AP image is acquired, it can be started as the ME system.

The system is going down NOW!
Sent SIGTERM to all processes
Sent SIGKILL to all processes
Requesting system reboot99] 
[08/30/2021 05:05:24.3599] reboot: Restart
Board type: AP1815I
smem ram ptable found: ver: 1 len: 3


U-Boot 2012.07 (btldr release 37) (Jan 07 2021 - 10:16:04)

This product contains some software licensed under the
"GNU General Public License, version 2" provided with
ABSOLUTELY NO WARRANTY under the terms of
"GNU General Public License, version 2", available here:
http://www.gnu.org/licenses/old-licenses/gpl-2.0.html

DRAM:  1022 MiB
Nand: Detected ONFI Macronix NAND 256MiB 3,3V 8-bit
NAND ECC=4 ECC_THRESHOLD(NAND ECC-1)=3
SF: Detected W25Q32 with page size 4 KiB, total 4 MiB
MFG data loaded
Scanning shenv data blocks
Total valid parts=4
Active shenv part[0:1], write_counter=6
machid: 8010001
Net:   MAC0 addr:50:2f:a8:96:b6:d0
AR8033 PHY 0
PHY ID1: 0x4d
PHY ID2: 0xd072
ipq40xx_ess_sw_init done
Auto boot mode, use bootipq directly
Hit ESC key to stop autoboot:  0 
Specified BOOT: part2 

Booting from part2

Read 1024 bytes from volume part2 to 88000000
Read 22070735 bytes from volume part2 to 88000000
Signature returns 0
Image signing verification success, continue to run... 
bootm 0x88000400 
## Booting kernel from Legacy Image at 88000400 ...
## Loading init Ramdisk from multi component Legacy Image at 88000400 ...
## Flattened Device Tree from multi component Image at 88000400
   Booting using the fdt at 0x89503188
   Loading Ramdisk to 9ecc6000, end 9ffff658 ... OK
   Loading Device Tree to 9ecba000, end 9ecc5c46 ... OK
no such device nand0
Using machid 0x8010001 from environment

Starting image ...

This method can try to solve the situation where LAP cannot be directly upgraded to ME mode (such as the error mentioned at the beginning of the document).

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