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No Recovery Mode no Download mode and yellow triangle

After a bad root the phone is stuck on the yellow triangle not being able to go in recovery mode what do i have to do?

Hello and welcome to Android Forums siklas! :)

I do not understand what you mean by, "After a bad root".

Providing you can get into Download mode, you can try rooting again by carefully reading and following the instructions in posts #1 & #2 of, "Rooting Galaxy S2 - Dummies Guide", over on the, "All Things Root", section of the forum.
 
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I dont know and phone doestn boot up so i can check kernel version

In that case you will have to flash a complete Samsung stock firmware to your phone to get you up and running.

To find the best firmware for you can you answer the following...

1. Your model of phone, (i.e. GT-i9100 or GT-i9100G or GT-i9100M or GTi9100P or GT-i9100T)?

2. Your location, (country)?

3. Was your phone running carrier branded stock firmware, (i.e. Vodafone, Telus, Bell, etc:)?
 
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CF-Root-SGS2_XW_XEF_ KJ2 -v5.0-CWM5.zip

That is not for rooting the, "G", variant of phone I'm afraid, as per the opening instructions in post #1 of the, "Rooting Galaxy S2 - Dummies Guide"...

Please read posts #1 and #2 carefully and thoroughly as they should answer most of your rooting queries.

This guide is for rooting the Samsung Galaxy S2, GT-i9100, GT-i9100M, GT-i9100T & GT-i9100P only and no other variant.***

If you are unsure of the model of your phone, go to Settings > About phone > Model number

(*** The Dummies Guide can also be used to root the, "GT-i9100G", on Gingerbread, (only), providing you use the root kernels mentioned in post #2, here)

I would go to link #2 mentioned above and flash either the Superatmos or Lucifr kernel as per instructions.

If you still cannot get into Download mode after carefully following the instructions and video in post #2 of the, "Rooting Galaxy S2 - Dummies Guide", you will instead have to flash a stock Samsung firmware for the, "G", variant.

There is no firmware for Cyprus or your carrier for the, "G", variant and so you will have to flash an unbranded version for, say, Saudi Arabia, using the instructions under the heading, "My firmware is not eligible for ICS yet but I want it now!", (ignore the file suggested), in this post. This will return you to your un-rooted, stock, state and you can then re-root using the correct method described above.
 
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Where can i find a guide to install stock roms?

Why... don't you like the one I referred you to in the last paragraph of my previous post?

There is no firmware for Cyprus or your carrier for the, "G", variant and so you will have to flash an unbranded version for, say, Saudi Arabia, using the instructions under the heading, "My firmware is not eligible for ICS yet but I want it now!", (ignore the file suggested), in this post. This will return you to your un-rooted, stock, state and you can then re-root using the correct method described above.
 
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Where can i find a guide to install stock roms?

From the title of your post, it seems you can't go into Recovery or Download mode. Then how can you install a new ROM since it requires going to Download mode?

I ask because I have the same problem, and I found this page using Google.

Have you found a way to bring back the download mode? Could you please share it?

I tried to install CWM on a stock android, but it failed for some reason. After that, I only see the image of a computer and a phone connected by a line, and on the line there is the yellow triangle.

I try to go to Recovery (power+vol. up) or Download mode (power+vol. down) or a simple turn-on (Power), but in all cases I get the same logo.
 
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