Incompatible secret key format between 2.4.4 and 2.2.27?

[mlist_e9e869bc at manycementmutable.anonaddy.com]

Hello all,

I'm trying to import a key generated from GPG 2.4.4 to 2.2.27 but 
unsuccessful.

Upon importing, it returns `gpg: no valid OpenPGP data found.`

I tried with compliance options but it does nothing.

Command I used:

- export: `gpg -a --export-secret-subkey <key_id> | gpg -a -c 
--cipher-algo AES --force-mdc -o <file>`
- import: `gpg --decrypt -o - keys.sec.asc | gpg --import -`

What else I can do? I can't update the GPG version because one of my
import device is an Android phone which stuck at 2.2.27 for quite a long
time.

Regards,
Hartman
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