ESP32-D0WDQ6-V3 with External Flash & PSRAM: Webserver serves blank pages #25127

jkwim · 2026-10-09T19:59:08Z

jkwim
Oct 9, 2026

I purchased a relay board with ESP32-D0WDQ6-V3, with External Flash & PSRAM chips, which had been pre-loaded with Tasmota.

05:46:00: ets Jul 29 2019 12:21:46

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DOUT, clock div:2
load:0x3fff0030,len:184
load:0x40078000,len:12732
ho 0 tail 12 room 4
load:0x40080400,len:2908
entry 0x400805c4

00:00:00.003-236/55 HDW: ESP32-D0WDQ6-V3 v3.0 (PSRAM)
00:00:00.023 CFG: Loaded from NVS, Count 14
00:00:00.029 Project tasmota - Tasmota Version 13.4.0(safeboot)-2_0_14(2024-02-14T16:15:48)
00:00:00.030 WARNING This version does not support persistent settings
00:00:00.341 WIF: WifiManager active for 3 minutes
05:46:01: 00:00:01.013 HTP: Web server active on tasmota-55188C-6284 with IP address 192.168.4.1

The web server was serving blank pages.

I attempted to reflash multiple times with different versions but ended up with same situation.

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:288
load:0x40078000,len:13400
load:0x40080400,len:2904
entry 0x40080554

00:00:00.003 HDW: ESP32-D0WDQ6-V3 v3.0 
00:00:00.008 CFG: Loaded from NVS, Count 4
00:00:00.012 Project tasmota - Tasmota Version 15.6.0(release-safeboot)-3.3.8(2026-08-25T09:01:05)
00:00:00.012 WARNING This version does not support persistent settings
00:00:00.378 WIF: WifiManager active for 3 minutes
35:03: 00:00:01.119 HTP: Web server active on tasmota-55188C-6284 with IP address 192.168.4.1

Although it shows that "HTP: Web server active" access to web server gets a blank page. Port 80 is open and can establish a connection.

Running out of ideas as how to solve the problem. I have done erazing and flashing as two distinct steps also:

esptool.exe -p COM3 erase_flash
esptool.py v4.8.1
Serial port COM3
Connecting....
Detecting chip type... Unsupported detection protocol, switching and trying again...
Connecting...
Detecting chip type... ESP32
Chip is ESP32-D0WDQ6-V3 (revision v3.0)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: 3c:e9:
Uploading stub...
Running stub...
Stub running...
Erasing flash (this may take a while)...
Chip erase completed successfully in 35.0s
Hard resetting via RTS pin...

esptool.exe -p COM3 write_flash 0x0 ..\v15.0.1_gitpod_20250919\tasmota32.factory.bin
esptool.py v4.8.1
Serial port COM3
Connecting.........
Detecting chip type... Unsupported detection protocol, switching and trying again...
Connecting...
Detecting chip type... ESP32
Chip is ESP32-D0WDQ6-V3 (revision v3.0)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: 3c:e9
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Flash will be erased from 0x00000000 to 0x002e2fff...
Compressed 3025536 bytes to 1873115...
Wrote 3025536 bytes (1873115 compressed) at 0x00000000 in 165.5 seconds (effective 146.2 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...

As the last resort I have flashed current release (15.6.0) using the web installer.

What could be going wrong?

sfromis · 2026-10-10T08:25:08Z

sfromis
Oct 10, 2026

One plausible issue could be that your USB port just does not supply the needed power for ESP32. With Wifi, the power draw of the ESP32 increases significantly. Avoid using an unpowered hub, but it is not given that your PC can supply enough on USB.

6 replies

sfromis Oct 10, 2026

Using a different adapter does not help if you USB port can't deliver the juice. Hard to predict specifics of behavior in case of borderline power being supplied.

jkwim Oct 10, 2026
Author

Power changed from laptop to external USB charger to direct AC supply to the board.

WiFi is there. I can connect to AP.

Port scanning shows port 80 is open.

Web pages do not get loaded.

Tried flashing two different versions 14 and latest 15 release.

Same observation.

Web interface does not get loaded.

sfromis Oct 10, 2026

Maybe you have installed some browser plugin or other fake security thing doing foot-shooting?

You could also have enabled a setting in your router regulating what device are allowed to work as a server.

jkwim Oct 12, 2026
Author

I gave the last try for this board.

STEP 1:
Flashed Tasmota Version 15.0.1(release-tasmota32)-3_1_3(2025-06-14T10:34:57).

(I have been trying different binaries but this time I erased the flash and then flashed tasmota32_factory.bin

That should have got on the board on to a clean state right?

STEP 2:
Then I added a 220uf capacitor between ESP32's VIN and GND pins.

Then this is what I saw:

STEP 3:
POWERON_RESET happened

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:268
ho 0 tail 12 room 4
load:0x40078000,len:13244
load:0x40080400,len:4
ho 8 tail 4 room 4
load:0x40080404,len:2928
entry 0x4008055c

00:00:00.001 HDW: ESP32-D0WDQ6-V3 v3.0 (PSRAM)
00:00:00.014 UFS: FlashFS mounted with 12596 kB free
00:00:00.026 CFG: Loaded from File, Count 8
00:00:00.034 QPC: Count 1
00:00:00.069 BRY: Berry initialized, RAM used 3493 bytes
00:00:00.081 Project tasmota - Tasmota Version 15.0.1(release-tasmota32)-3_1_3(2025-06-14T10:34:57)
00:00:00.334 WIF: WifiManager active for 3 minutes
ets Jul 29 2019 12:21:46

Immediately after a SW_RESET got triggered.

rst:0x3 (SW_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:268
ho 0 tail 12 room 4
load:0x40078000,len:13244
load:0x40080400,len:4
ho 8 tail 4 room 4
load:0x40080404,len:2928
entry 0x4008055c
3:00:09:51: 
00:00:00.001 HDW: ESP32-D0WDQ6-V3 v3.0 (PSRAM)
00:00:00.014 UFS: FlashFS mounted with 12596 kB free
00:00:00.026 CFG: Loaded from File, Count 8
00:00:00.028 FRC: Some settings have been reset (2)
00:00:00.063 BRY: Berry initialized, RAM used 3493 bytes
00:00:00.074 Project tasmota - Tasmota Version 15.0.1(release-tasmota32)-3_1_3(2025-06-14T10:34:57)
00:00:00.378 WIF: WifiManager active for 3 minutes
3:00:09:52: 00:00:01.100 HTP: Web server active on tasmota-55188C-6284 with IP address 192.168.4.1
3:00:09:58: 00:00:06.993 QPC: Reset

RESULT: No AP Appears

STEP 4:

Then I issued a Restart 1 command:

3:00:12:09: restart 1
00:02:17.785 CMD: restart 1
00:02:17.787 RSL: RESULT = {"Restart":"Restarting"}
3:00:12:10: 00:02:18.937 APP: Restarting
ets Jul 29 2019 12:21:46

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:268
ho 0 tail 12 room 4
load:0x40078000,len:13244
load:0x40080400,len:4
ho 8 tail 4 room 4
load:0x40080404,len:2928
entry 0x4008055c

00:00:00.001 HDW: ESP32-D0WDQ6-V3 v3.0 (PSRAM)
00:00:00.017 UFS: FlashFS mounted with 12596 kB free
00:00:00.030 CFG: Loaded from File, Count 9
00:00:00.039 QPC: Count 1
3:00:12:11: 00:00:00.076 BRY: Berry initialized, RAM used 3493 bytes
00:00:00.088 Project tasmota - Tasmota Version 15.0.1(release-tasmota32)-3_1_3(2025-06-14T10:34:57)
00:00:00.341 WIF: WifiManager active for 3 minutes
ets Jul 29 2019 12:21:46

SW_RESET gets triggered

rst:0x3 (SW_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:268
ho 0 tail 12 room 4
load:0x40078000,len:13244
load:0x40080400,len:4
ho 8 tail 4 room 4
load:0x40080404,len:2928
entry 0x4008055c

00:00:00.001 HDW: ESP32-D0WDQ6-V3 v3.0 (PSRAM)
00:00:00.017 UFS: FlashFS mounted with 12596 kB free
00:00:00.031 CFG: Loaded from File, Count 9
00:00:00.032 FRC: Some settings have been reset (2)
00:00:00.069 BRY: Berry initialized, RAM used 3493 bytes
00:00:00.081 Project tasmota - Tasmota Version 15.0.1(release-tasmota32)-3_1_3(2025-06-14T10:34:57)
3:00:12:12: 00:00:00.334 WIF: WifiManager active for 3 minutes
00:00:00.025 HTP: Web server active on tasmota-55188C-6284 with IP address 192.168.4.1
3:00:12:19: 00:00:06.956 QPC: Reset

RESULT: no difference. Cannot see AP. Tried both laptop and mobile.

STEP 5:
Disconnected USB connection and then powered the board using AC supply. Ideally this should have cleared any power/voltage issue as power comes from the on board power supply.

RESULT: no difference. Cannot see AP. Tried both laptop and mobile

What am I dealing with? a bad Flash?

Different Tasmota binaries gave different observations.

One last thing to try is to flash 13.4.0(safeboot)-2_0_14(2024-02-14T16:15:48) which came with the board.

sfromis Oct 13, 2026

A very important detail is that if you get a restart quickly after
00:00:00.334 WIF: WifiManager active for 3 minutes
that is a strong indication of the ESP32 not getting enough power. Maybe not every time, but just seeing it once. Maybe your wiring/soldering is weak.

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ESP32-D0WDQ6-V3 with External Flash & PSRAM: Webserver serves blank pages #25127

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ESP32-D0WDQ6-V3 with External Flash & PSRAM: Webserver serves blank pages #25127

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jkwim Oct 9, 2026

Replies: 1 comment · 6 replies

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sfromis Oct 10, 2026

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jkwim Oct 12, 2026 Author

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sfromis Oct 13, 2026

jkwim
Oct 9, 2026

Replies: 1 comment 6 replies

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Oct 10, 2026

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jkwim Oct 12, 2026
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