Tryin to update to 2.1 (CLARO-PR) - Sony Ericsson XPERIA X10 Mini

Hi
Nice forum you got here
LMGTFY arrived here for support on upgrading an E10a fw 1.6 from carrier CLARO PUERTO RICO to at least fw 2.1
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I read here I will need (stable one) 2.0.A.0.504 but can't find it cause multiupload went down...
Any help or suggestions?
(and yes, before asking I do search and read... a lot)
thanks in advance

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any help?
at least a clue: which 2.1 is stable with my carrier?
(still doing search)

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Please help me with this:
Code:
INFO - Device connected with USB debugging on
INFO - Connected device : E10
INFO - Installed version of busybox : BusyBox v1.19.0 (2011-08-14 23:46:58 CDT) multi-call binary.
INFO - Android version : 1.6 / kernel version : 2.6.29
INFO - Selected X10a_1.0_2_1_A_0_435.ftf
INFO - Preparing files for flashing
INFO - Please connect your device into flashmode.
INFO - Device disconnected
INFO - Device connected in flash mode
INFO - Opening device for R/W
INFO - Reading device information
INFO - Phone ready for flashmode operations.
INFO - Start Flashing
INFO - Flashing loader
INFO - Loader version : R4A045 / Bootloader status : UNROOTABLE
INFO - Flashing kernel.sin
ERROR - ERR_SEVERITY="MAJOR";ERR_CLASS="SECURITY_CLASS";ERR_STATIC="SIN_HEAD_VER";ERR_DYNAMIC="Failed to verify sin header";
ERROR - Error flashing. Aborted
Thats weird: I just rooted it, installed recovery, backed up the tried this

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have you tried using SEUS

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Thanks for reply
I do tried seus but theres no official update for my carrier/country thats why Im here
Some progress: succesfuly applied root with "exploid" (now recognize root access)
But im looking for E10a "Generic version 2.1update1 build 2.0.A.0.504 (MD5: F3735BF4D48ED4BBA8BF5BC60CD1D34C)" only foun the same multiupload lead link.
Still doing some research