Custom esp8266 board with error: A fatal error occurred: (Failed to connect to ESP8266: Timed out waiting for packet hea

[theshbbl]

Hi, I designed recently a custom esp8266 (ESP12E) with usb-c (used ch340c) that controls multiple triacs via optoisolators. My question is when I try uploading code into the custom pcb the output keep saying Connecting…._…. and in the end it says A fatal error occurred: Failed to connect to ESP8266: Timed out waiting for packet header. The below image is the schematic I hope someone could figure out any missing/wrong connections.

Edit: When I connected gpio15 and gpio0 to gnd it won't flash either but it got connected to HTerm (standalone serial monitor program)

after pressing RTS the output is

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

load 0x40100000, len 1856, room 16 
tail 0
chksum 0x63
load 0x3ffe8000, len 776, room 8 
tail 0
chksum 0x02
load 0x3ffe8310, len 552, room 8 
tail 0
chksum 0x79
csum 0x79

2nd boot version : 1.5
  SPI Speed      : 40MHz
  SPI Mode       : DIO
  SPI Flash Size & Map: 32Mbit(512KB+512KB)
jump to run user1 @ 1000

rf cal sector: 1017
rf\[112\] : 00
rf\[113\] : 00
rf\[114\] : 01

SDK ver: 1.5.4.1(39cb9a32) compiled @ Jul  1 2016 20:04:35
phy ver: 972, pp ver: 10.1

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SW1 with DTR outputs

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<\r><\n> ets Jan 8 2013,rst cause:2, boot mode:(1,7)<\r><\n><\r><\n>

connecting gpio0 to gnd with RTS shows

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<\r><\n> ets Jan 8 2013,rst cause:2, boot mode:(1,6)<\r><\n><\r><\n>

my schematic: