I will buy another esp01 (the new version with 1mb flash memory) and I will test again, perheaps my esp01 have a problem ...
Currently I'm using an old version from ai-thinker (9.2.2), but as this version is very unstable this isn't a solution.
The main problem: I want to use the esp with an avr328p with 8MHz, and 115200 is a bad uart speed for this application. If default baud rate would be 9600 like in previous firmware versions, than it wouldn't be such a mess that the baud rate isn't saved. In this case I could program the esp to whatever I want within the avr code after startup, but with 115200 as default this is impossible.
Please use Espressif official Flash Download Tool to write bin files into Flash http://bbs.espressif.com/viewtopic.php?f=57&t=433.
If your problem is still unsolved, please provide the captured picture of ESP Flash Download Tool while downloading.
Thanks for your interest in ESP8266 !
In the end I solved it by flashed the newest version (2.0.0, with AT 1.3.0), even though the documentation says it needs 8 MBit it seems to be working fine so far on a 4 MBit chip. I used this guide: https://syonyk.blogspot.com/2016/11/installing-latest-at-firmware-on-4mbit.html#comment-form. So far, version 2.0.0 is the only one that will save the configuration on AT+UART_DEF etc. in a way that survives a reset.
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