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I followed this guide: http://ez-gui.com/manual/multiwii-clear ... Connection
I have chip's RST connected to 3.3v through 1k Ohm resistor (as in the guide).
I have everything same except CH_PD not connected to 3.3v, RST and GPIO0 are not grounded, and no capacitor.
I spent like 4 hours figuring out how to make it work.
And all what I got is sometimes (it did 3 times) I got something like this [01]'strange symbol'[03]'strange symbol'[03]'strange symbol' and so on. Every message was different.
It did not respond on any of my commands (AT, AT+GMR).
Am I doing something wrong? or board is dead?

Well, I just did straight upload standard firmware. I was successful.
Now it responds on commands, finally
But when the wifi board loads it sends strange strings:
r[18][02][00]lœ˜rŸ[00]Œc[02]ân€[04][18]à[0C][18]Œ[0C][1C]‚ì[1C]pŒ|Ž‚Ÿ[00]ìx[02]’ßÇ’œäŒ[1C]p[0C][18][0C]ònnä[02]„;òn„’œä[0C][1B]Ž[0C]bç$[19]r[18][02]r[18][02]pònàƒÜ[00][0C][1C]à‚‡Àl[1C]€[0C][1C]€[0C][1C]€[0C]b€[04]nâãn€Ä[1E]ŽŒ[1C]€[0C][1C]p[0C][18]Œònnî[03]ÄÃŒŽ[00]l`[1B]ü[12]œ#‚n€[04][1C]r[18][02][0E][02]nrŽ’Ÿ;[02]„À[0C]žŒ[1C]r[18][02]pònàƒÜ[00][0C][1C]àr‡[1C]âœ[1B][02][0C][1C]€[0C][1C]p[0C][18]p’œ<[02]„ã[0C]Žà[0C]b€Ä>~ònî[03]Äà[0C][18]r[10][02][12]œ#‚n€$[1E]Œl`[1B]ä8`rn|’’n€[04][1C]à’‡Àl`[1B][04]9~[02]„À[0C][18][12]œ#‚n€$[1C]Œ[0C][10]Œònnî[03]ÄØl`[1B][04]nnàÃÜ[00][0C][1C]àr‡[1C]âœ[1B][02]ì[1C][0C][02][0C]b€[04]nâãn€ä[1E]à[0C][1F]à[0C]bÀÄ>~ònî[03]ÄÁŒ[1C][00]l`[1B]ü[12]œ#‚n€[04]Ž{[18][02][0E][02]nrŽ’Ÿ;[02]„À[0C]‚[0C]œ{[18][02][0E]rŸÛ’n€[04][1E]à[12]Ç[18]’`[1B]üdon't use rtc mem data
r[18][02]Ž[1B]Ã;ú
ready
r[18][02][00]lœ˜rŸ[00]Œc[02]ân€[04][18]à[0C][18]Œ[0C][1C]‚ì[1C]pŒ|Ž‚Ÿ[00]ìx[02]’ŸÇ’œäŒ[1C]p[0C][18][0C]ònnä[02]„;òn„’œä[0C][1B]Ž[0C]bç$[1B]r[18][02]r[18][02]pònàƒÜ[00][0C][1C]à‚‡Àl[1C]€[0C][1C]€[0C][1C]€[0C]b€[04]nâãn€Ä[1E]ŽŒ[1C]€[0C][1C]p[0C][18]Œònnî[03]ÄÁŒŽ[00]l`[1B]ü[12]œ#‚n€[04][1E]r[18][02][0E][02]nrŽ’Ÿ;[02]„À[0C]žŒ[1C]r[18][02]pònàƒÜ[00][0C][1C]àr‡[1C]âœ[1B][02][0C][1C]€[0C][1C]p[0C][18]p’œ<[02]Œã[0C]Žà[0C]b€Ä<~ònî[03]Äà[0C][18]r[18][02][12]œ#‚n€$[1E]Œl`[1B]ä8`rn|’’n€[04][1E]à’‡Àl`[1B][04];~[02]„À[0C][18][12]œ#‚n€$[1C]Œ[0C][10]Œònnî[03]ÄØl`[1B][04]nnàƒÜ[00][0C][1C]àr‡[1C]âœ[1B][02]ì[1C][0C][02][0C]b€[04]nâãn€ä[1E]à[0C][1F]à[0C]b€Ä>~ònî[03]ÄÁŒ[1C][00]l`[1B]ü[12]œ#‚n€[04]Ž{[18][02][0E][02]nrŽ’Ÿ;[02]ÄÀ[0C]‚[0C]œ{[18][02][0E]rŸÛ’n€[04][1E]à[12]Ç[18]’`[1B]üdon't use rtc mem data
r[18][02]Ž[1B]Ã;ú
ready
AT
AT


OK

"I have everything same except CH_PD not connected to 3.3v, RST and GPIO0 are not grounded, and no capacitor."

Well, the chip will not even boot unless CH_PD is up, and both GPIO0 and GPIO2 must be properly connected, too. I also had a problem similar to yours, when I tried to power the ESP from the 3v3 line in the FTDI; but It could also happen if the baud rate is wrong.

Hi

Me just got this esp-01 module working . had connected ch-pd and rst pins to 3.3v using 10k rsistor . worked for me . but wonder why it gives INVALID after booting .