I also struggled with 6.2.4u2 but no luck with my limited knowledge. Replacing rd.gz zImage with ones from 6.2.4update2 pat before building loader is failed.
Solution to fix update fail from 6.2.4 to 6.2.4-2
My solution is rollback to 6.2.4
* Please backup the data if it is important !!
(I suppose without data loss after rollback)
1. login the console with root (without password)
2. mount /dev/md0 /mnt
3. rm -rf /mnt/.syno
4. http://NAS-IP:5000
Select "Migration: Keep my data and most of the settings"
Install original pat (DSM_DS3615xs_25556.pat) # 271 MB
RedPill - the new loader for 6.2.4 - Discussion
in Developer Discussion Room
Posted · Edited by datahunter
Solution to fix update fail from 6.2.4 to 6.2.4-2
My solution is rollback to 6.2.4
* Please backup the data if it is important !!
(I suppose without data loss after rollback)
1. login the console with root (without password)
2. mount /dev/md0 /mnt
3. rm -rf /mnt/.syno
4. http://NAS-IP:5000
Select "Migration: Keep my data and most of the settings"
Install original pat (DSM_DS3615xs_25556.pat) # 271 MB