Its stuck on some timer mode.. i am unable to use any of the buttons on it

Here are some steps you can try to get your Magnet (KARLSON) double oven out of demo mode:

Press and hold the "Timer" button for 5 seconds.
If the above step doesn't work, try pressing and holding the "Timer" and "Cook Time" buttons simultaneously for 5 seconds.
If the oven still remains in demo mode, try unplugging it from the power source for 30 seconds and then plugging it back in.

If none of these steps work, please refer to the user manual or contact Magnet's customer support for further assistance

It sounds like you're experiencing an issue with your Casio F91W watch not allowing you to change modes, specifically the time-changing and timer modes. Here are a few things you can try to resolve the issue:

1. Check the watch's manual: Consult the watch's manual for instructions on how to properly change modes and set the time and timer. Make sure you are using the correct buttons and following the correct steps.
2. Check the watch's battery: Make sure the battery is properly installed and has enough power. If the battery is low, it may cause issues with the watch's functions.
3. Check the watch's buttons: Make sure the buttons on the watch are not stuck or damaged. Clean the buttons with a soft cloth if needed.
4. Try a reset: If the above steps don't work, you can try resetting the watch. Consult the watch's manual for instructions on how to reset the watch.
5. Check for a hardware issue: If none of the above solutions work, the issue could be caused by a hardware problem with the watch. In this case, you may need to contact the manufacturer or a repair professional to have the watch serviced.

It's possible that one of the above solutions will resolve the issue, but if not, it's best to consult the watch's manual or contact the manufacturer for further assistance.

You must have set a timer record. Press the button that sets a timer recording and cancel them. If you have the manual check what it says if you don't have a manual Panasonic do have PDF of most videos free. IF you can't clear try the factory reset opition.

The timer initializes in MANual mode.
To reach SET UP, press MODE button until set-up displays.
If MODE button does not work, then timer has a serious glitch.

1) If this is a timer that worked correctly before, and recently malfunctioned, then try replacing CR2 battery. The timer display and programming functions are dependent on the battery, so when battery starts going dead, the timer does odd things.
http://waterheatertimer.org/ST01C-program.html#battery

2) Try resetting timer.
Hold down ON-OFF button and then push reset button for two seconds.
Release Reset button, but keep holding ON-OFF button until display flashes INIT.
Then release ON-OFF button and 12:00 displays.
Following page has easy to follow programming steps:
http://waterheatertimer.org/ST01C-program.html

3) ST01C has 1 year limited warranty, and people write in about defective timers each day.
There are no repair parts other than the battery.
Manual says when all other attempts fail, then reset timer as described above.
http://www.intermatic.com/products/timers/consumer%20indoor%20timers/in-wall%20timers/st01c.aspx

4) If this is new timer, then exchange defective timer for new timer.
I test timers: 4-6% arrive defective. Many go bad first year or two. Some last quite a while.
Some programmable timers can be reset and the timer recovers, as described above.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, fixya expert speaks with you over phone while you work on timer.

Check the remote carefully for a stuck button. You may have pressed a button and it went a bit crooked getting stuck.
Also, remove the batteries of the remote and try operating the TV manually. If the remote is the cause, the TV will work correctly once you remove the batteries.
Another way to check is by using a digital camera, like the one in a cell phone. Turn on the camera and point it at the remote. If you see a white light coming from the transmitter, the remote is sending a signal. Look for a stuck button.

A stuck reset switch keeps the timer in a rest mode so that nothing else will function. Try to operate the switch so as to free it. Then reprogram the timer if you are successful.

You posted under Intermatic HB88RC timer
If you have different timer, add a comment

HB88RC timer manual:
http://waterheatertimer.org/pdf/hb88rc.pdf

Here's HB88RC programming from the top:
Remove batrery from back of timer to reset timer and clear everything.
Re-install AA battery in timer so display will show, and you can program

Set clock:
Hold down clock button.
Press day button until current day displays.
Press Hour button until current hour displays.
Press min button until current minute shows.
Release clock button

Program timer:
Press PROG button until 1 ON displays
This is Event1 ON
Press Day button until selected day or days displays for event1 ON
If you want all week long, then press day button until all days show: MO TU WE TH FR SA SU
Press Hour button until 7pm shows >> this is event1 ON
Press Min button until :00 displays for event1 ON

Press PROG button until 1 OFF displays
This is Event1 ON
Press Day button until selected day or days displays for event1 OFF
Match days with ON time: so press day button until all days show: MO TU WE TH FR SA SU
Press Hour button until 12pm displays >> this is event1 OFF
Press Min button until :00 displays for event1 OFF

When programming is finished, press clock button to display current time

When programming is finished, press MODE button to select MODE > you want AUTO for timer programs to operate
Press MODE button once and this is manual override, and lights come on.
Press MODE button again and RDM displays, this is for random timer operation
Press MODE button 3rd time, and timer is set to AUTO
After setting MODE to auto, press clock button to display current time.

Plug timer into receptacle.
Plug lights into timer.

Add a comment any time.
A lot of folks have written in about this timer going bad and they have been unable to program the timer. Of course most timers work perfectly fine.

If your oven has timer and it is flashing AUTO then you need to reset it to manual for it to work.
If no timer then it could be a faulty door micro switch, located at the front left side..\Hope this helps, please leave feed back.
Thanks

Im thinking that maybe you a have a timer recording set. The whole unit wont function at all if you turn it on via power button (remote or unit). There should be a button at the top of the remote called 'timer set' pressing this will disable that mode and allow complete use of everything. but make sure u press timer set again when powering down, otherwise simply turning off the machine will leave the timer recording disabled.

take your set to a tech your problem is more a technical problem that sounds as you are having a chip problem that controls the timer