ESP8266-07 blue LED always on, garbage UART output, unresponsive after upload

The ESP8266-07 module, when started in normal mode (without the GPIO0 jumper from GND), lights up with a blue LED all the time and continuously sends rubbish through the UART and does not respond to commands from the terminal. This happens regardless of the firmware version uploaded and the transmission parameters selected in the terminal.
On the other hand, I have no problem with uploading the software. In programming mode, the chip behaves normally.

The board is soldered to a popular 2.54 mm raster converter. It has built-in resistors pulling up CH_PD to VCC and GPIO15 to GND. However, the problem also occurs when I pull up these pins externally.

For communication I use an FT232 based converter that has been tested on other devices. It supports 3.3V logic of course.

I have tried powering the circuit from a module like the one below. On the internet many people have successfully powered their ESP8266 with this. I tried with 100nF and 220uF capacitors added - no result. Using a Pololu u1v10f3 inverter connected to a 1A power supply did not help either.


The only other thing that puzzles me is that I have no Rainsun name on the antenna of the circuit and instead of a red dot there is a red rectangle. I don't know if this is a sign of some kind of counterfeit. I bought the board from a Polish online shop for robotics.

Probably GPIO 15 not connected to GND. In this case, the ESP8266 is trying to settle to "boot from SD-Card" mode.

As I wrote, the pin is connected to ground.

I don't know what difference it makes , but normally GPIO 2 is connected to VCC.

I have already tried with this too.

The ESP can pull a relatively high amount of current when booting, in excess of 200mA in a peak, and the contact board and cables can have a definite resistance (for power cables) and on the ESP itself in a peak the voltage can drop below the minimum. So test the voltage as close to the ESP as possible and make sure it's not too low.
By the way, from my observations, before the peak comes, the ESP spits out 2-3 lines of normal boot messages.

P.S. IMHO this is the ESP's biggest problem, the biggest current draw is right after power up and we have no power over that!

Everything was ok with the voltage, but there were none of those messages you mentioned.

I bought a second such chip and everything is fine with the same power supply. It's just that I have a defective piece.

Thank you for your help.