sony st18i not unlocked and credit lost

Welcome to Octoplus/Octopus Suite version 1.3.8
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Platform: SE Qualcomm
Selected model: ST18i
Connecting to server…OK
Octopus smart card is present.
Checking smart card…OK
Smart card activations: LG, Samsung, Medusa
Username: serxxxxxxx
Authorizing…OK
Checking balance…OK
Your balance: 50 credits.
To unlock ST18i you need to have 40 credits.
——————————————————————————————-
Platform: SE Qualcomm
Selected model: ST18i
Please, reconnect battery, attach testpoint and connect USB cable…OK
Sending preloader…OK
Please, disconnect testpoint.
Waiting for preloader…OK
Reading info…
IMEI: 359590-04-416xxx-4
MSN: CB511VMZRJ
Sending loader…OK
Reading info…OK
IMEI: 359590-04-416xxx-4
Checking security…OK
Reading security area…OK
Backup saved to "C:\Archivos de programa\Octoplus\Octoplus_Suite
\BACKUP\Sony Ericsson_ST18i_35959004416xxx_07-01-2016_14-50-
08.BKP"
Checking TA…OK
IMEI: 359590-04-416xxx-4
Calculating security on the server…
Sending TA to server…OK
Calculating. Please, wait…OK
Receiving TA…OK
Checking security area…
Writing security area…Failed!
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——————————————————————————————-
Platform: SE Qualcomm
Selected model: ST18i
Connecting to server…OK
Octopus smart card is present.
Checking smart card…OK
Smart card activations: LG, Samsung, Medusa
Username: serxxxxx
Authorizing…OK
Checking balance…Failed!
Too low balance to provide the security operation!
Your balance: 10 credits.
To unlock ST18i you need to have 40 credits.