In the Linksys EA6350 v4 router section (https://openwrt.org/toh/linksys/ea6350_v4) there is a link to the "OEM Firmware" which must be downloaded and flashed before flashing the "factory snapshot image". I have not been able to install the OpenWrt firmware because I do not have that file and if I try to do it by directly flashing the "factory snapshot image", the procedure does not work.
Is it possible to restore the link to the OEM Firmware file?
Linksys has broken the link; not OpenWrt.
This is the firmware page from Linksys.
Read the OpenWrt page on installing and how to prevent it from reverting back to stock on its own.
It is a great router; I love mine.
If you keep "trying things" and not following the steps as written by OpenWrt you are going to, eventually, brick it.
Hello LilRedDog, thank you for your prompt response.
My router already has the latest firmware version (4.0.4.207984).
What would the procedure be like? Correct me if I'm wrong:
Use the Linksys GUI to flash the Linksys OEM firmware (v.4.0.4.207984). The device will now boot Linksys GUI from partition B.
Flash OpenWrt squashfs-factory image with Linksys GUI, it will be installed on partition A and will boot.
If the router boots with OpenWrt, proceed to remove s_env to prevent it from reverting to the Linksys stock firmware after three reboots.
If from now on the router will always boot from OpwnWrt, can I install OpenWrt updates from LuCI without problems?
You, really, should read the page and the links to workarounds.
If you read the page and all links and you do not feel you have answers you are welcome to come back and ask what you, specifically, do not understand.
But as for #4 (which is two questions)
A) Not always, because if done correctly and it fails to boot 3 times it will revert to the Linksys partition. You do not want to lose that partition.
B) I'm not saying yes to that either. Q.E.D. A.
Well, I'll try the whole procedure again.
Read the whole page.
You have missed some things.
The OpenWrt Linksys EA6350 v4 page says:
Installing OpenWrt
This device has a dual partition layout (A/B). One partition is set as active and boots. If boot fails three times, than the “other” partition is set as active and booted, assuming it is still safe. A bootcounter (stored in the partiton S_ENV) is used for this purpose. The bootcounter has a flaw that prevents direct install of OpenWrt. Use this procedure to bypass:
Use the Linksys GUI to flash the Linksys OEM firmware. The device will now boot Linksys GUI from partition B.
Flash OpenWrt squashfs-factory image with Linksys GUI, it will be installed on partition A and will boot.
You will be able to boot OpenWrt three times from partition A, until the bootcounter flaw set back partition B as bootable (with Linksys GUI). To prevent this, add this code to etc/rc.local
/rom/sbin/mtd unlock s_env
/rom/sbin/mtd erase s_env
exit 0
I listed steps 1 to 3 on the OpenWrt page and added a fourth point, asking if after installing OpenWrt and removing s_env (to prevent three reboots from loading partition B with Linksys firmware) it was possible to update OpenWrt from LuCI, so I don't know what you mean when you say I'm forgetting some things 
Did you read the link about having trouble with flashing?
I was already able to install OpenWrt, but I had to install LuCI from the SSH console.
Thank you.
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