Dead devices on i2c3?

I’ve been having issues with trying to get i2c working. The most recent involved connecting a 3.3V slave through a level shifter to i2c4 (as in the bus I get when I do an i2cdetect -y 4). Something went very badly and on reboot there were many error messages. I reflashed and I “think” I’m not seeing the error messages any more (dmesg looks ok).

However, according to http://elinux.org/Jetson/I2C I should get:

$ sudo i2cdetect -y 3
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: – -- – -- – -- – -- – -- – -- –
10: – -- – -- – -- – -- – -- – -- – -- – --
20: – -- – -- – -- – -- – -- – -- – -- – --
30: – -- – -- – -- – 37 – -- – -- – -- – --
40: – -- – -- – -- – -- – -- – -- – -- – --
50: 50 – -- – -- – -- – -- – -- – -- – -- –
60: – -- – -- – -- – -- – -- – -- – -- – --
70: – -- – -- – -- – --

and

$ sudo i2cdetect -y -r 3
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: – -- – -- – -- – -- – -- – -- –
10: – -- – -- – -- – -- – -- – -- – -- – --
20: – -- – -- – -- – -- – -- – -- – -- – --
30: – -- – -- – -- – 37 – -- 3a 3b – -- – --
40: – -- – -- – -- – -- – -- – -- – -- – --
50: 50 – -- – -- – -- – -- – -- – -- – -- –
60: – -- – -- – -- – -- – -- – -- – -- – --
70: – -- – -- – -- – --

However, I do not see ‘37’ or ‘3b’. Can anyone confirm if that’s ok? What devices do those correspond to? (If you know please tell me how you figured that out)

Thanks