Hello All,
Thanks for your prompt reply. I did some workaround for this issue that I 
described below. It may not be good practice and I might miss something, 
but I was only doing some proof of concept work so it was ok for me.

1. from web search, i saw -c option is used to specify a configuration file 
for the sysupgrade (link: 
http://www.polarhome.com/service/man/?qf=sysupgrade&tf=2&of=NetBSD&sf=8 ). 
I felt like this is not necessary at least for my testing.
2. I went ahead and modified the upgrader script in this location - 
/opt/openwisp2/env/lib/python3.9/site-packages/openwisp_firmware_upgrader/upgraders/openwrt.py
 
and removed the "-c" from the command.
[image: openwisp_firmware_upgrade_script_modification.png]
3. retired the upgrade again and it was a success. I used a base image 
directly downloaded from OpenWRT website.
4. in my OpenWRT devices, i saw my configurations were there (e.g - i had a 
openVPN connection with pfSense before the upgrade and after the upgrade 
config is still there, and the tunnel was established).
5. for OpenWISP, I saw config file is there (in /etc/config/openwisp), but 
the OpenWISP package itself was missing. After some reading, I found out 
it's normal that packages are not retained after sysupgrade.
6. As a workaround, I built a custom image with pre-installed my necessary 
packages and did the firmware upgrade using it. After the upgrade now 
everything is good, including packages as those were already pre-baked.

Hope this helps!
Thank you.
On Sunday, May 15, 2022 at 6:43:33 AM UTC-4 [email protected] wrote:

> Hi,
>
> I think I have seen the error before, If I remember correctly.
> The problem in my case was that some of files and folders were mounted as 
> readonly in the filesystem, so I suggest look for that.
>
> P.S: I never fixed the issue, I only have a couple of routers, so I just 
> flashed new version instead of upgrade.
>
> Best,
> Ajay T.
>
>
> On Friday, May 13, 2022 at 1:19:46 AM UTC+5:30 f.capoano wrote:
>
>> Hi Mirja,
>>
>> That log you shared is coming from the OpenWrt output of the sysupgrade 
>> -c command.
>>
>> I think that if you execute the same command manually you would get the 
>> same error, try to execute the upgrade manually, eg:
>>
>> scp image.bin root@<ip>:/tmp
>> sysupgrade -c /tmp/image.bin
>>
>> I never encountered this error but it looks like something which has to 
>> be debugged on the OpenWrt side, because it's not normal that part of the 
>> overlay filesystem is missing.
>>
>> Best regards
>> Federico Capoano
>>
>> On Wed, May 11, 2022 at 2:34 PM Mirja Shahriar Enan <[email protected]> 
>> wrote:
>>
>>> Hello, 
>>> OpenWISP Firmware Upgrade is failing with this error - *" Cannot find 
>>> '/overlay/upper/etc', required for '-c' "*
>>> *OpenWRT version tried - * 19.07.9, 21.02.2, 21.02.3
>>> Tried multiple devices but all same. In the device, I see the *overlay* 
>>> folder but nothing in it.
>>> Not sure how to work around this, appreciate any help :)
>>>
>>> *Screenshot -*
>>>
>>> [image: Screenshot_2.png]
>>>
>>>
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