Here is the instruction on programming Toyota & Lexus smart key H type transponder all keys lost situation via MasterKey III MKIII key programmer.
First read Toyota 93C86 eeprom by using Orange 5 eeprom programmer
Run MKIII software
Select Utilities tab->Key Generator->Key by Dump->T->Toyota->SMART BOX->Masterkey preparation by dump (93C86)
Open dump (saved by Orange5)
Select Key Number
Save file (name file 93C86.SMART.BOX.AFTER I)
Back to Orange 5 software
Click on Upload tab
Upload the dump file (93C86.SMART.BOX.AFTER I) just saved by MK3
Generated key can start as master key
Then add a new key by using OBDSTAR X100 Pro key programmer.
Follow X-100 pro to add a key, it is not difficult.
Done. Test the new added key.
Orange 5 programmer to read & write eeprom
MK III to program smart H transponder
OBDSTAR X-100 Pro to add a H key