Hello @marvin33, Welcome to the /e/ users forum.
/e/ builds are expected to include the needed pixel firmware parts, relative to their android level :
/e/OS community oriole download
piero@HP-p6-2038fr:~/Téléchargements$ ./payload-dumper-go -l e-4.0-a16-20260610633937-community-oriole.zip
Please wait while extracting payload.bin from the archive.
payload.bin: /tmp/payload_475790201.bin
Payload Version: 2
Payload Manifest Length: 121241
Payload Manifest Signature Length: 267
Found partitions:
abl (2.1 MB), bl1 (12 kB), bl2 (545 kB), bl31 (90 kB), boot (67 MB), dtbo (17 MB), gsa (278 kB), ldfw (4.1 MB), modem (98 MB), pbl (49 kB), product (1.1 GB), pvmfw (1.0 MB), system (1.8 GB), system_ext (511 MB), tzsw (5.9 MB), vbmeta (8.2 kB), vbmeta_system (4.1 kB), vbmeta_vendor (4.1 kB), vendor (622 MB), vendor_boot (67 MB), vendor_dlkm (60 MB)
piero@HP-p6-2038fr:~/Téléchargements$
downgrading GogolOS to 16 seems nomore possible,
So, you should have a try to simply installing /e/OS-a16.
(restoring stock GogolOS 17 is easy in case of problem)