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Is there anybody out there who got the ipkg (or opkg ) package manager running on a Synology DS412+ with DSM 4.3, or someone who knows how to do so?

I've tried to install by GUI, used the package from 'quadrat4', but a modal message occurred that it can't be installed properly. Next I tried to install via SSH as 'root'. I was following the few step-by-step tutorials I've found around the internet. But none of these variants will work for me.

cd /volume1/tmp
wget http://ipkg.nslu2-linux.org/feeds/optware/syno-i686/cross/unstable/syno-i686-bootstrap_1.2-7_i686.xsh
chmod +x syno-i686-bootstrap_1.2-7_i686.xsh
sh syno-i686-bootstrap_1.2-7_i686.xsh
ln -s /volume1/@optware /opt
vi /etc/profile
    #PATH=/opt/bin:/opt/sbin:$PATH
vi /root/.profile
    #PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/syno/sbin:/usr/syno/bin:/usr/local/sbin:/usr/local/bin
    #export PATH
reboot
After doing all the steps as described, I just get:
ipkg update
-ash: ipkg: not found
Hope you can help me out with this!
You don't need to comment out #PATH=/opt/bin:/opt/sbin:$PATH in your /etc/profile, you need that path to use the ipkg command.
Also try ls /opt/bin/ to see if ipkg has really been installed.
There's a Medium article from September 1, 2019 that suggests installing opkg (or ipkg for older DiskStation models) with Easy Bootstrap Installer from a custom source:
  
The Most famous lite weight package managers are ipkg and opkg.
  ipkg is considered dead. So I recommend everyone to use opkg instead.
How To Install a Package Manager on a Synology NAS/Router (ipkg/oPKG)
I tried this today on my ancient Synology DiskStation 212+ and it couldn't install opkg because the Linux kernel is too old for the DS 212+, but the software referred to in the article can also install ipkg, and that worked in my case.
It looks like old DiskStation models don't upgrade their Linux kernel at some point.
                Easy Bootstrap Installer is not working for DSM7 users anymore due to changes in package format as discussed on EBI maintenance forum synology-forum.de/threads/ebi-easy-bootstrap-installer.68335/…
– igor
                Jan 19 at 10:09
In 2018 (DSM6) is better to use opkg. Anyway both can be installed with:
Install ipkg - https://chattim.wordpress.com/2016/05/08/install-ipkg-on-synology-via-gui/
1. Package Center>Settings>Package source 
2. add https://www.cphub.net/
3. search pkg
4. install EasyBootstrapInstaller > oPkg
5. don't install iPKGui is blocking the UI
6. reboot
7. sudo su -
8. root:~# opkg
                I don't remember. But a search on google on ipgk vs opkg gives a lot of reasons like "he reason for creating opkg was that ipkg was an effectively a dead end project (not dead, just a dead end). OE has had ipkg patches sitting around for years and there was no active ipkg maintainer and no active ipkg development. I was perfectly happy to see ipkg being renamed and development continued under a new banner."
– raisercostin
                Jan 5, 2020 at 13:15
                Or "The opkg utility is the lightweight package manager used for this job. Opkg is a fork of ipkg, the package manager used in NSLU2's Optware, which is designed to add software to stock firmware of embedded devices. Opkg is a full package manager for the root file system, including kernel modules and drivers, while ipkg is just a way to add software to a separate directory (e.g. /opt)."
– raisercostin
                Jan 5, 2020 at 13:15
                Easy Bootstrap Installer is not working for DSM7 users anymore due to changes in package format as discussed on EBI maintenance forum synology-forum.de/threads/ebi-easy-bootstrap-installer.68335/…
– igor
                Jan 19 at 10:08
                Please quote the essential parts of the answer from the reference link(s), as the answer can become invalid if the linked page(s) change.
– DavidPostill
                Mar 24, 2021 at 18:05
For okpg (entware) please follow this guide: https://github.com/Entware/Entware/wiki/Install-on-Synology-NAS
I have just verified it on Synology DS418j (Realtek RTD1293 / aarch64) running DSM 7.0-41882.