Bonjour,
 
Après de nombreux tests infructueux pour configurer mes fi8918w, j'ai décidé d'updrader le firmware... Mauvaise idée !  
 
j'ai 2 cam, cam1 firmware 11.22.2.30 webui : 2.4.18.15 et cam2 avec 11.37.2.48 et webui 2.4.10.2
 
depuis j'ai pu enfin paramétrer cam1 en wifi ça fonctionne
 
MAIS CAM2 NON alors ou bien j'oublie un truc ou bien il faut que je revienne sur l'ancien firmware, mais comment ?  
 
bien sur, j'ai fait un reset sur la cam2 et la seule chose qui change c'est la disparition du mot de passe que j'ai choisis.
 
pour info, la led verte derrière clignotte très lentement (1 vert ttes les 2 secondes) lorsque j'enlève le cable ethernet
 
Donc voilà, j'ai lu le gros topics de Paillasou où tout est super intéressant mais je l'ai trouvé après mes betises et cela dit depuis j'ai pu en installer une donc il est bien ce topic quand on lit bien mais je n'ai rien trouvé concernant mon problème
 
Par ailleurs, j'ai SFRBOX normale + win 7 et les 2 cam me plantent ie, c'est bizarre ça non ?
 
J'espère que je vais trouver de l'aide  
 
à bientôt de vous lire (j'espère  )
 
christelle    
 

 
Yes. This is possible.
 
Please note: If you install the wrong firmware version in the wrong cameras, generally you will loose WiFi and need to connect the camera via Ethernet to gain access to the camera.
 
If you cannot access the cameras WEB UI ("User Interface" ) you can still use the IP Camera Finder Tool to re-install firmware, in many, if not most cases. Please see the bottom area of this post for how to do that:
 
http://www.openipcam.com/forum/ind [...] 473.0.html
 
For this IP Camera Model, on the bottom of the IP Camera you will see something that has "FR" or "VNT".
 
If you see "FR" then you need to re-install firmware versions that start with "11.37.x.x".
 
If you see "VNT" then you need to re-install firmware versions that start with "11.22.x.x".
 
This is because there are two different hardware versions for this IP Camera model and each hardware version uses a different WiFi board inside these IP Cameras. IP Cameras with "FR" on the bottom support 802.11n. IP Cameras with "VNT" on the bottom only support 802.11b/g.
 
You can find the current firmware versions for this IP Camera model in two places. You will need to register in both cases before you can download firmware:
 
http://foscam.com/help.aspx?TypeID=11
 
http://foscam.us/firmware.html
 
Don

j'ai le même problème. Après être passé à la version 11.37.2.51 plus de wifi !!
Le WEB UI fonctionne bien.
Mes caméras sont des FI8908W (ancien modèle équivalent aux 8918 maintenant) et se sont des VNT6656G6A40
Impossible de redescendre à une version 11.22.x.x

If you have installed the x.x.x.51 version of system firmware in a camera, you cannot go back to older system firmware releases. You can install other x.x.x.51 versions of system firmware ("If you made a mistake and installed the wrong x.x.x.51 system firmware for your camera" ) or newer system firmware releases.
 
This is because a new checksum is used to validate the system firmware prior to it being installed in your camera. Older system firmware releases use a different checksum. So older system firmware versions will fail to install, once you have installed a x.x.x.51 system firmware version.
 
There are many security fixes in the x.x.x.51 system firmware versions and you should install this version to avoid having your camera exploited. More information here:
 
http://www.openipcam.com/forum/ind [...] 534.0.html
 
The only way to restore an older system firmware version in your camera, once a x.x.x.51 system version has been installed in your camera. Is to use a serial connection to your camera. Which will void the warranty for your camera, in most cases.  
 
It would also require, that you have a copy of the older system firmware version stored on disk and that you use a utility called fostarn, to unpack that system firmware version into the two parts actually contained in it. linux.zip and romfs.img. You should also have the Web UI firmware that came with that older system firmware versions stored on disk as well. It's never a good idea to install a Web UI firmware version for a system firmware version that was not included, with that system firmware version. Any older Web UI version can still be installed even after a x.x.x.51 system firmware version has been installed.
 
Example: The example below is for a specific IP Camera. The serial connection location, image numbers and their byte locations and any byte offsets those images may use, for recovering your camera maybe different. This is why "Best Practice" would be to create a working serial interface for your camera while it's still in good working order. Before making questionable firmware changes. So that you can take notes about this information, ahead of time. In order to properly recover your camera if those questionable firmware changes fail:
 
http://www.openipcam.com/forum/ind [...] 473.0.html
 
If possible. Try and contact the seller and see if they have a x.x.x.51 version for your camera available. Because even if you do go back to a older system firmware version. Depending on how old that system firmware version is. Virtually anyone located anywhere in the world, can at anytime, dump your cameras configuration, exposing any email, ftp and camera User Id and Password information. See the security fixes link above, for more details.
 
In your case. Since you already have installed a x.x.x.51 system firmware versions for a Foscam FI8918W in your camera. You can try to install the 11.22.2.51 firmware version for the FI8918W here:
 
http://foscam.com/down3.aspx
 
Note: The FI8908W is NOT the equivalent of a FI8918W. If the bottom of your camera has a "VNT" followed by a MAC address and not a "FR" you should never install system firmware that starts with these two sets of digits "11.37" and vise versa. Cameras with "VNT" on the bottom, only support 802.11 b,g wireless and have a different daughter board inside the camera for WiFi then cameras that have "FR" on the bottom of the camera and they support 802.11 b,g,n. Because these WiFi boards are different in the camera. When you install the wrong system firmware for the camera. You WILL lose wireless since that system firmware is looking for a different WiFi board in the camera, which is not in the camera.
 
The only way to regain wireless for the camera, is to install over what system firmware you did install in the camera, with the proper firmware for your camera. Since you have already installed system firmware x.x.x.51 in your camera. This now means that you are now limited to only being able to install the proper firmware for the camera that is a x.x.x.51 system firmware version and above ("If you are using Foscam system firmware version numbers" ).
 
That said. This may or may not work. Since there are no system firmware versions of x.x.x.51 specifically for the FI8908W located in the Foscam download area. Since the FI8908W model has been discontinued, by Foscam. Which again, is NOT the equivalent of the FI8918W. Meaning. You may need to contact the seller for your camera to get the equivalent system firmware version of Foscam's x.x.x.51 system firmware for your camera or need to install an older version of firmware back into your camera using the serial interface methods shown in the link above. Which, once again most likely will continue to expose your camera to many security vulnerabilities for your camera.
 
It should be noted. That personally I have no idea if this new checksum is being used by Foscam firmware versions x.x.x.51 and above exclusively or is also being used by other sellers of clones of these cameras. This could mean. That even IF the seller were to give you the equivalent system firmware version of Foscam's x.x.x.51 system firmware that your sellers version will now, NOT install in your camera. So, that would leave only the serial upgrade process shown above to install the sellers system firmware. If because of installing the Foscam system firmware, that sellers system firmware fails to install. Due to a failed checksum.
 
Since you did not have notes from using a serial connection to the camera of when the camera was functioning correctly. You really have no clue of what image numbers are normally used, what their byte locations are or if they use any byte offsets for any of those images. Which even with a working serial connection to the camera, after the fact. May complicate recovering your camera.
 
Both you and others need to be aware that because of this changed checksum in system firmware releases. That recovering cameras will not be as easy as it was in the past. When the wrong system firmware is installed. Now and in the future. It may require you to create a serial connection to the camera to recover the camera. Whereas in the past, this was not always the case.  
 
Because of this new checksum being used in system firmware versions for cameras. I would NOT try this or that questionable firmware install now or in the future, without truly understanding this new risk of doing so. Even if you are willing to use a serial connection to the camera, to restore the camera back to normal. You better also have notes of where things are located in your cameras memory, when the camera was functioning properly and a copy of both working system firmware and Web UI firmware, stored on disk, for your camera, before doing so.
 
Additionally. Had you read the "Read me.txt" file that was included with the firmware you installed. You would of seen that it "Clearly" states that once you installed this system firmware version, you will NOT be able to go back to older system firmware versions. So. It might be worth the extra time to read the files included in newer firmware releases, prior to "Pulling the trigger". Which says and includes:
 
"Note: After upgrading to this version, it cannot downgrade to previous versions."
 
Don