diff --git a/doc/erko_howto_tools.txt b/doc/erko_howto_tools.txt
index 141b288b153c33f45a6e0fb3e1692ef7b6e5ce65..3e7f7265908b4ecf9b7978956102a86cde97f643 100755
--- a/doc/erko_howto_tools.txt
+++ b/doc/erko_howto_tools.txt
@@ -1,5 +1,6 @@
 * RadioHDL with GIT (LOFAR2.0)
 * Flash and reboot unb2
+* Flash and reboot on L2TS using tunnel to SDPTR
 * RadioHDL with SVN (APERTIF/ARTS)
 * RadioHDL issues
 * ARGS
@@ -274,6 +275,139 @@ Last SDPFW version used in 2022:
   read firmware_version:
   node 64:  2022-11-06T02.45.36_e6769e2e3_lofar2_unb2b_sdp_station_full_wg
 
+*******************************************************************************
+* Flash and reboot on L2TS using tunnel to SDPTR
+*******************************************************************************
+
+4 sept 2023
+How to reach the SDP Translators on LCU2 in CS001? I got this from Reinier and Pieter to tunnel to the SDPTR, so that I can run the flash commands:
+
+ssh -C -N -L 4840:10.99.0.250:4840 10.87.1.41 &
+10.99.0.250:4840 is de raspberrypi waar de sdp translator op draait op poort 4840
+10.87.1.41 is dop491
+Op de PC waar je dit ssh commando uitvoert kun je je dan de sdp translator bereiken op (localhost, poort 4840)
+De eerste 4840 in het commando mag ook een andere waarde hebben
+Instead of dop491 I need to fill in LCU2. And how do I then distinguish between the different SDPTR instances?
+
+Jan David Mol
+LCU2 is cs001c.control.lofar (10.151.255.1).
+LBA translator loopt op poort 4840, HBA0 op 4842, HBA1 op 4844
+
+ssh -C -N -L 4840:10.99.0.250:4840 10.151.255.1
+yes (accept fingerprint), ctrl-z, bg
+
+:kooistra@dop466:/dop466_0/kooistra/git/sdptr$ sdp_rw.py --host 10.151.255.1 --port 4840 -r firmware_version
+read firmware_version:
+node  0:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node  1:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node  2:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node  3:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node  4:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node  5:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node  6:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node  7:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node  8:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node  9:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node 10:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node 11:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node 12:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node 13:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node 14:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node 15:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+:kooistra@dop466:/dop466_0/kooistra/git/sdptr$ sdp_rw.py --host 10.151.255.1 --port 4842 -r firmware_version
+read firmware_version:
+node 16:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node 17:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node 18:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node 19:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+:kooistra@dop466:/dop466_0/kooistra/git/sdptr$ sdp_rw.py --host 10.151.255.1 --port 4844 -r firmware_version
+read firmware_version:
+node 20:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node 21:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node 22:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+node 23:  2023-04-15T18.27.13_c9dfeffb9_lofar2_unb2c_sdp_station_full
+
+:kooistra@dop466:/dop466_0/kooistra/git/sdptr$ sdp_rw.py --host 10.151.255.1 --port 4840 -r global_node_index
+read global_node_index:
+node  0:  0
+node  1:  1
+node  2:  2
+node  3:  3
+node  4:  4
+node  5:  5
+node  6:  6
+node  7:  7
+node  8:  8
+node  9:  9
+node 10:  10
+node 11:  11
+node 12:  12
+node 13:  13
+node 14:  14
+node 15:  15
+:kooistra@dop466:/dop466_0/kooistra/git/sdptr$ sdp_rw.py --host 10.151.255.1 --port 4842 -r global_node_index
+read global_node_index:
+node 16:  16
+node 17:  17
+node 18:  18
+node 19:  19
+:kooistra@dop466:/dop466_0/kooistra/git/sdptr$ sdp_rw.py --host 10.151.255.1 --port 4844 -r global_node_index
+read global_node_index:
+node 20:  20
+node 21:  21
+node 22:  22
+node 23:  23
+
+# HBA-1
+sdp_rw.py --host 10.151.255.1 --port 4844 -r firmware_version
+sdp_firmware.py --host 10.151.255.1 --port 4844 --reboot --image FACT
+sleep 60
+sdp_rw.py --host 10.151.255.1 --port 4844 -r firmware_version
+sdp_firmware.py --host 10.151.255.1 --port 4844 --write --image USER --file /dop466_0/kooistra/hdl_build_results/20230902/2023-09-02T18u54_lofar2_unb2c_sdp_station_full_215MHz/lofar2_unb2c_sdp_station_full-e3ec2b2bb.rbf
+sdp_firmware.py --host 10.151.255.1 --port 4844 --reboot --image USER
+sleep 60
+sdp_rw.py --host 10.151.255.1 --port 4844 -r firmware_version
+
+# HBA-0
+sdp_rw.py --host 10.151.255.1 --port 4842 -r firmware_version
+sdp_firmware.py --host 10.151.255.1 --port 4842 --reboot --image FACT
+sleep 60
+sdp_rw.py --host 10.151.255.1 --port 4842 -r firmware_version
+sdp_firmware.py --host 10.151.255.1 --port 4842 --write --image USER --file /dop466_0/kooistra/hdl_build_results/20230902/2023-09-02T18u54_lofar2_unb2c_sdp_station_full_215MHz/lofar2_unb2c_sdp_station_full-e3ec2b2bb.rbf
+sdp_firmware.py --host 10.151.255.1 --port 4842 --reboot --image USER
+sleep 60
+sdp_rw.py --host 10.151.255.1 --port 4842 -r firmware_version
+
+# LBA
+sdp_rw.py --host 10.151.255.1 --port 4840 -r firmware_version
+sdp_firmware.py --host 10.151.255.1 --port 4840 --reboot --image FACT
+sleep 60
+sdp_rw.py --host 10.151.255.1 --port 4840 -r firmware_version
+sdp_firmware.py --host 10.151.255.1 --port 4840 --write --image USER --file /dop466_0/kooistra/hdl_build_results/20230902/2023-09-02T18u54_lofar2_unb2c_sdp_station_full_215MHz/lofar2_unb2c_sdp_station_full-e3ec2b2bb.rbf
+sdp_firmware.py --host 10.151.255.1 --port 4840 --reboot --image USER
+sleep 60
+sdp_rw.py --host 10.151.255.1 --port 4840 -r firmware_version
+
+:kooistra@dop466:/dop466_0/kooistra/git/sdptr$ sdp_rw.py --host 10.151.255.1 --port 4840 -r firmware_version
+read firmware_version:
+node  0:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node  1:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node  2:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node  3:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node  4:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node  5:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node  6:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node  7:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node  8:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node  9:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node 10:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node 11:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node 12:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node 13:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node 14:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+node 15:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
+
+This is the image with time transposed order of beamlets data to CEP (L2SDP-961).
 
 *******************************************************************************
 * RadioHDL with SVN