Rtl8735b(HUB 8735) can't program(at arduino)

hi all,
HUB 8735 can’t program(at arduino)
有什麼建議 ?

使用平台 arduino 1.8.9,usb ttl :cp2102

1.short A5 and v3.3 then reboot(己進入download mode)

== Rtl8735b IoT Platform ==

Chip VID: 0, Ver: 0

ROM Version: v3.0

Test Mode: boot_cfg1=0x0

[test mode PG]

test_mode_img_download

Download Image over UART1[tx=4,rx=3] baud=115200

  1. 使用arduino download,

Please Enter Flash Mode Manually!

05

04

03

02

01

Start Upload Flash

Uploading.ucfg fail

Uart boot fail

End Upload Flash

hi @_lin

可以尝试换 USB TTL 芯片吗?建议换成 FTDI 或者 CH340 试试。CP2102 最高速度好像有点慢