How to flash Aliexpress bulbs from ESP8266 (FL-M11-V2.0) to SmartLife?

Hi

I've rummaged through the nooks and crannies for 2 "Aliexpress" branded light bulbs. Both are signed that they can be paired with SmartLife. But well, the pairing does not work. The bulbs have been lying around since 2019 unmoved.

Both pieces based on the well-known and well-loved ESP8266. The difference is that I don't have the RX, TX, GND and GPIO0 clearly shown on the PCB. PCB view below

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Do you have any tips on how to go about flashing this FL-M11-V2.0 and what would play best there? Tasmota?

Maybe Tuya-convert will work?
The SC3-01 SmartLife switch and ESP firmware upload via WIFI (tuya-convert/OTA) .
And if not then it's worth either looking at the underside of the module to see if the pins are labelled on the underside, or taking a multimeter and searching with a multimeter where GPIO0 leads.
Tasmota should work fine on these bulbs.

I have unsoldered the 2 boards and there is a set of rx tx 3.3v gnd pins and I00 I02. I checked the transition and I00 is gpio0. The esp itself is alive because I can read the serial

ets Jan 8 2013,rst cause:2, boot mode:( 3,6)

load 0x40100000, len 2592, room 16
tail 0
chksum 0xf3
load 0x3ffe8000, len 764, room 8
tail 4
chksum 0x92
load 0x3ffe82fc, len 676, room 4
tail 0
chksum 0x22
csum 0x22

2nd boot version : 1.7(5d6f877)
SPI Speed : 40MHz
SPI Mode : QIO
SPI Flash Size & Map : 8Mbit(512KB 512KB)
jump to run user1 @ 1000

OS SDK ver: 2.0.0(e8c5810) compiled @ Jan 25 2019 14:26:04
phy ver: 1055_9, pp ver: 10.7

rf cal sector: 121
idle_task_hdl : 40107bd0,prio:0, stack:384
tim_task_hdl : 40107d18,prio:2,stack:512
[notice]user_main.c:310 SDK version:2.0.0(e8c5810)
[notice]user_main.c:314 fireware info name:oem_esp_light_tuya version:3.3.16
[notice]user_main.c:317 tuya sdk compiled at Jun 12 2019 19:50:52
[notice]user_main.c:319 BV:5.45 PV:2.2 LPV:3.3
reset reason: 6
epc1=0x00000000,epc2=0x00000000,epc3=0x00000000,excvaddr=0x00000000,depc=0x00 000000
mode : null
mode : sta(98:f4:ab:b7:8f:cf)
add if0
scandone
[notice]gw_intf.c:405 Authorization success
del if0
usl
sul 0 0
mode : null
force slp enable,type: 2
fpm open,type:2 0
[notice]mqtt_client.c:576 gw wifi stat is:0
[notice]mqtt_client.c:576 gw wifi stat is:0

Unfortunately the standard flashing to tasmote is not possible after driving gpio0 to gnd. Apparently the serial is quieting down but something else extra must be going on.

Do everything according to the procedure, i.e. IO0 is to be shorted to GND at the time of reboot. I short IO0 to GND, disconnect the whole thing from power and reconnect power. Then it is in bootloader mode and esptool can read or upload the batch.

Just shorting IO0 to ground already while the ESP is running won't do anything, you have to do a RESET or power off/on.

Also maybe change RX and TX places for a test.

Thanks, I've already forgotten the whole procedure for flashing the ESP8266 itself. I use Wemos and other ready-made boards for the lazy.

Tasmota has basked in its glory on the forgotten bulb of 2019.

00:00:00 CFG: Use defaults
00:00:00 Project tasmota Tasmota Version 8.1.0(lite)-2_6_1
00:00:00 WIF: WifiManager active for 3 minutes
00:00:00 HTP: Web server active on tasmota-4047 with IP address 192.168.4.1
00:01:31 WIF: Hostname %s-d, SSId1 AiP, SSId2 , CORS
00:01:32 APP: Restarting

Thanks for your help