Thx that helped :-) community++
 

I tried it, but after recovering in 2.5.2 the wallet from seed. I still see the pending tx in a history and BTCs are not available.
What else I can try?

Hi all,
I sent an tx with older electrum client. It has not been confirmed since 3 days.
I can see on Blockchaininfo: Transaction rejected by our node. Reason: Non-canonical signature: High S Value

I noticed on the net that this old client generates signature which is now nonstandard.
Electrum 2.5.2 should be fixed now.

But what with the tx itself?
I have there BTC which I can not operate now with.

What can I do to make the transaction wiped out and BTC back to my wallet.

Many thanks for ideas.