Hope this helps somebody out there ! I almost gave up but there IS a way.
You don't need the cable or anymore than simply telnet (if available), please note via GUI it will work but it's a bit more complicated.
Before moving on, a test that will write OUT the current CFE:
dd if=/dev/mtdblock/0 of=/tmp/BROKEN_cfe8500.bin
(this will export to /tmp/BROKEN_cfe8500.bin the current CFE boot)
Now confirm you have the same sizes of the two bin files (just in case):
ls -lisa /tmp/*.bin
Files must have the same size, if you see zeroes, ABORT!
root@DD-WRT:/tmp# ls -lisa *.bin
26509 516 -rw-r--r-- 1 root root 524288 Jan 1 1970 BROKEN_cfe8500.bin
42094 512 -rw-r--r-- 1 root root 524288 Jul 3 23:20 cfe8500.bin
and now the MAGIC!
Command in bold will WRITE the GOOD cfe8500.bin boot in the router:
root@DD-WRT:/tmp# dd if=/tmp/cfe8500.bin of=/dev/mtdblock/0
1024+0 records in
1024+0 records out
Flash is NAND
root@DD-WRT:/tmp# Connection closed by foreign host.
Your router will NOW keep the settings after reboots!!!
Tested myself after nvram reset, then applied this config, wifi working perfect.
It's not perfect for anyone but is a great start, wasted all yesterday figuring out how the hell to configure this. Missing the Smart Rule quick setup and band switching settings from Merlin.
Moderator edit: Broke up original image into 3 separate images since you can have 3 attachments per post per forum software config. Had the OP listened to both myself and another moderator, the attached images wouldn't look so blurry. Unfortunately, most of the other images were removed from this thread previously and the overall picture is obscured by that decision.
_________________ Netgear R8500
Last edited by puremind on Tue Jul 09, 2019 21:50; edited 5 times in total
Koolshare firmware for Netgear, including R8500, is based on Merlin + Vortex ASUS FW
After flashing the CFE then DDWRT was able to keep settings stored.
Leaving the note here in case it helps somebody else, as the mtd commands offered in other posts never worked while my commands up there did.
Auto channels for Merlin , Koolshare or stock FW gave me the top speed via Wi-Fi
While for DDWRT was very poor speed without fiddling big time. Definitely something to improve there. _________________ Netgear R8500
The damns ads and the DNS breaking all over. Really?
If this helps, I've managed to get the damn thing working after a few days of battling.
Get a cheap usb stick and plug it in the USB 2 0 port, disable JFFS in memory and only use and mount the USB stick for everything, jffs, swap and optware... you must do this in order to get everything proper!
You can then install optware (when YOU have /opt and /jffs pointing to the usb stick)
For MIPSEL based devices (Broadcom, not dual core), this:
#Here your favourite DNSs or open DNS or whatever is NOT your ISP
#Here your additional /etc/hosts files to remove adds, same format as someonewhocares
#Here your forced dhcps
You'd get your router to server DNS via DNSMASq using as servers quad9 and 184.108.40.206 but blocking whatever is on /etc/hosts
To get /etc/hosts autoupdated to remove a lot of ads sites and crap, put this portion to /jffs/etc/config/start.startup for incremental updates. If you want other places to get ads lists from, serve yourselves.
EDIT: Script has been copied to a text attachment.
#This is to refresh the list of blocked sites for ads and anything else that's on /etc/hosts
curl -k -X GET https://someonewhocares.org/hosts/hosts -o /jffs/dnsmasqtempnew
cat /jffs/dnsmasqtempnew >> /jffs/dnsmasqtemp
cat /jffs/dnsmasqtemp | sed -e 's/^[ t]*//' | grep -v ^# | sort | uniq > /jffs/dnsmasqtempnew
cat /jffs/dnsmasqtempnew > /jffs/dnsmasqtemp
cat /jffs/dnsmasqtemp >> /etc/hosts[/code]