add info

Docs/FLASH_GETSET_DEV.md

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+# Clone ONU Info
+Some ISP have restriction how ONU get authenticated, in this guide, how to get old ONU Info and update to ONU Stick
+
+# Get Info
+You need to login into old ONU, most ONU will have information page where you can get:
+* Software Version
+* Hardware Version
+* Serial Number (SN)
+* Manufacture Info
+* Device Type
+
+## Example
+### G-240G-E
+
+
+### HG8240H
+
+
+### HG8240H5
+
+
+## Update
+After you get required info, you can start run `flash set`, example:
+```
+flash set PON_VENDOR_ID ALCL
+flash set HW_CWMP_MANUFACTURER Nokia
+flash set HW_CWMP_PRODUCTCLASS SFU
+flash set HW_HWVER 3FE48153CBAA
+
+flash set OMCI_VEIP_SLOT_ID 255
+flash set OMCI_OLT_MODE 1
+flash set OMCI_FAKE_OK 1
+flash set OMCI_SW_VER1 3FE46606BGCB45
+flash set OMCI_SW_VER2 3FE46606BGCB45
+flash set GPON_ONU_MODEL G-240G-E
+flash set GPON_SN ALCL00000000
+flash set GPON_PLOAM_PASSWD 1234567890
+
+flash set ELAN_MAC_ADDR 781735000000
+```
+
+## Original
+You may need to write down your original value:
+```
+flash get PON_VENDOR_ID
+flash get HW_CWMP_MANUFACTURER
+flash get HW_CWMP_PRODUCTCLASS
+flash get HW_HWVER
+flash get OMCI_VEIP_SLOT_ID
+flash get OMCI_OLT_MODE
+flash get OMCI_FAKE_OK
+flash get OMCI_SW_VER1
+flash get OMCI_SW_VER2
+flash get GPON_ONU_MODEL
+flash get GPON_SN
+flash get GPON_PLOAM_PASSWD
+flash get ELAN_MAC_ADDR
+```