Solution : https://service.sap.com/sap/support/notes/28979 (SAP Service marketplace login required)
Key words :
/usr/sap/<sid>/sys/exe/run/sapinstance /usr/sap/<sid>/sys/exe/run/saprootmodify, profile file /usr/sap/<sid>/sys/profile/start_g<nr>_<host> end begin valid, /home/ftp/general/r3server/patches/rel31i/unixas archive files gui_31i, mkdir <instdir> chmod 777 <instdir> cp <cd_local>/gui/unix/<os>/diinst <instdir> 8, /sapcd/gui/unix/<os>/ <cd_local>/gui/unix/<os> cp -, /usr/sap/trans /sapmnt/<sapsid> /usr/sap/<sapsid> 3, /sapcd/gui/unix/common/ <cd_local>/gui/unix/common 6, <cd-dir>/gui/unix/<os>/diinst begin valid, file startsap_<hostname>_<nr>delete lines 138-181, /free/sapcd/gui/unix/common/install
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| 85254 | Installing a Dialog Instance/ Gateway, 4.0x/4.5A |
| 51708 | INST: R/3 Inst.-Install a Dialog Inst. with DIINST |